Vigilancia de Infecciones Respiratorias Agudas en niños y adolescentes en un Servicio de Pediatría

Introducción: Las infecciones agudas de vías respiratorias inferiores, de etiología viral, constituyen la principal causa de hospitalización y mortalidad infantil. El objetivo del presente estudio es conocer la frecuencia de las infecciones respiratorias agudas grave (IRAG) y los virus prevalentes en pacientes ≤15 años. Materiales y Métodos: Estudio observacional, descriptivo, producto de la vigilancia de IRAG, periodo enero/2019-mayo/2023. Se incluyeron todos los pacientes ≤15 años hospitalizados con diagnóstico de IRAG. Se analizaron datos demográficos, características clínicas y evolutivas. Resultados: Fueron hospitalizados 256 pacientes ≤15 años con diagnóstico de IRAG, 54,3%(139/256) de sexo masculino. El 69,1% correspondían a <2años, 15,6% de 2 a 4 años y 15,2% de 5 a 19 años. El 17,5% presentaban factores de riesgo. El 3,5% (9/256) tenía vacuna anti-influenza. El mayor número de casos se objetivó en 2019. En 2020 y 2021 se registró el menor número de casos, relacionado a la política de encierro durante la pandemia de COVID-19. El virus prevalente fue el Virus Sincitial Respiratorio (VSR). En el 2019, el VSR fue el virus más frecuente (p<0.0001.RR=1,56.IC95%= 1,18 - 2,06); el SARS - CoV2 fue el más frecuente en 2020. Según grupo etario el VSR fue más frecuente en <2 años (p<0.0001.RR=1,70.IC95%=1,18-2,06) y el SARS - CoV2 en los ≥2 años (p<0.0001.RR=2,50.IC95%=2,53-3,53). El VSR no fue asociado a factores de riesgo. El 39,4%(101/256) requirió ingreso a la UCIP, situación más frecuente en pacientes con factores de riesgo (21,7%vs14,8%,NS). El ingreso a UCI fue más frecuente en los <2 años (44,1% vs 29,1%;p<0,02.RR=1,51.IC95%=1,03-2,22). No hubo diferencias significativas del requerimiento de UCI y los virus aislados. La letalidad fue del 7,8%(20/256), más frecuente en el sexo femenino (p<0.02.RR=0,36.IC95%=0,1-0,9), no asociado a la edad ni etiología. Conclusion: La IRAG por VSR constituye una causa importante de hospitalización en <2 años, más frecuente en el sexo masculino. El ingreso a UCIP fue más frecuente en los <2años. La letalidad fue más frecuente en el sexo femenino.

Introduction: Acute lower respiratory tract infections, of viral etiology, are the main cause of hospitalization and infant mortality. The objective of the present study is to know the frequency of severe acute respiratory infections (SARI) and prevalent viruses in patients ≤15 years of age. Materials and Methods: Observational, descriptive study, product of SARI surveillance, period January/2019-May/2023. All patients ≤15 years of age hospitalized with a diagnosis of SARI were included. Demographic data, clinical and evolutionary characteristics were analyzed. Results: 256 patients ≤15 years old with a diagnosis of SARI were hospitalized, 54.3% (139/256) male. 69.1% corresponded to <2 years, 15.6% from 2 to 4 years and 15.2% from 5 to 19 years. 17.5% had risk factors. 3.5% (9/256) had an anti-influenza vaccine. The highest number of cases was observed in 2019. In 2020 and 2021, the lowest number of cases was recorded, related to the confinement policy during the COVID-19 pandemic. The prevalent virus was Respiratory Syncytial Virus (RSV). In 2019, RSV was the most common virus (p<0.0001.RR=1.56.95%CI= 1.18 - 2.06); SARS - CoV2 was the most frequent in 2020. According to age group, RSV was more frequent in <2 years (p<0.0001.RR=1.70.CI95%=1.18-2.06) and SARS - CoV2 in those ≥2 years (p<0.0001.RR=2.50.95%CI=2.53-3.53). RSV was not associated with risk factors. 39.4% (101/256) required admission to the PICU, a more frequent situation in patients with risk factors (21.7% vs 14.8%,NS). Admission to the ICU was more frequent in those <2 years (44.1% vs 29.1%; p<0.02.RR=1.51.95%CI=1.03-2.22). There were no significant differences in the ICU requirement and the isolated viruses. The fatality rate was 7.8% (20/256), more frequent in females (p<0.02.RR=0.36.95%CI=0.1-0.9), not associated with age or etiology. Conclusion: SARI due to RSV is an important cause of hospitalization in <2 years, more frequent in males. Admission to the PICU was more frequent in those <2 years old. Fatality was more frequent in females.

Modelado matemático del efecto de las medidas de cuidado por COVID-19 sobre otras enfermedades respiratorias / Mathematical modelling of the impact of COVID-19 care measures on other respiratory diseases

RESUMEN INTRODUCCIÓN Los modelos matemáticos de la transmisión de enfermedades infecciosas permiten estudiar distintos mecanismos que afectan su comportamiento temporal. Este trabajo analizó el efecto sobre la dinámica de la influenza y el virus sincitial respiratorio (VSR) de la disminución de la transmisibilidad debida a las medidas de cuidado adoptadas para reducir la circulación de COVID-19. MÉTODOS Se empleó un modelo determinista tipo SIRS (susceptible-infectado-recuperado-susceptible) con modulación estacional para representar la influenza y el VSR, en ambos casos con inmunidad de corta duración y ciclo anual. Los cambios en la transmisibilidad de la enfermedad se modelaron reduciéndola durante dos años y planteando distintos escenarios. RESULTADOS En el modelo planteado, la reducción en la transmisibilidad genera cambios que se sostienen en los años siguientes: eventos epidémicos muy pronunciados con alargamiento del intervalo interbrote. Este efecto resulta dominante respecto del comportamiento estacional. El escenario de una reducción inicial de la transmisibilidad del 40% resulta compatible con el comportamiento de influenza y VSR reportados actualmente para Argentina. DISCUSIÓN El modelo general propuesto, en condiciones de disminución transitoria en la transmisibilidad, exhibe una epidemiología compatible con la observada recientemente en Argentina para ambas enfermedades e ilustra el modelado como herramienta útil en la comprensión de efectos no intuitivos.

ABSTRACT INTRODUCTION Mathematical models of infectious diseases transmission allow to study different mechanisms which affect their temporal behavior. This work analyzed the impact of the decrease in transmissibility, as a result of measures of personal care adopted to reduce circulation of COVID-19, on the dynamics of influenza and respiratory syncytial virus (RSV). METHODS A deterministic SIRS (susceptible-infected-recovered-susceptible) model with seasonal modulation was used to represent two diseases with short-term immunity and annual cycle: influenza and RSV. Changes in disease transmissibility were modeled by reducing it for two years and analyzing different scenarios. RESULTS In the proposed model, transmissibility reduction brings changes which sustain in the following years: very pronounced epidemic events with lengthening of the inter-outbreak interval. This effect prevails over the seasonal behavior. The scenario of 40% initial reduction in transmissibility is compatible with the behavior of influenza and RSV currently reported in Argentina. DISCUSSION The general model proposed here, under conditions of temporary reduced transmissibility, shows an epidemiology compatible with recently reported data of influenza and RSV in Argentina. This result illustrates modeling as a useful tool to understand non-intuitive effects.

Economic burden of respiratory syncytial and parainfluenza viruses in children of upper-middle-income countries: a systematic review

Abstract Objective: To identify and assess the current evidence available about the costs of managing hospitalized pediatric patients diagnosed with Respiratory Syncytial Virus (RSV) and Parainfluenza Virus Type 3 (PIV3) in upper-middle-income countries. Methods: The authors conducted a systematic review across seven key databases from database inception to July 2022. Costs extracted were converted into 2022 International Dollars using the Purchasing Power Parity-adjusted. PROSPERO identifier: CRD42020225757. Results: No eligible study for PIV3 was recovered. For RSV, cost analysis and COI studies were performed for populations in Colombia, China, Malaysia, and Mexico. Comparing the total economic impact, the lowest cost per patient at the pediatric ward was observed in Malaysia ($ 347.60), while the highest was in Colombia ($ 709.66). On the other hand, at pediatric ICU, the lowest cost was observed in China ($ 1068.26), while the highest was in Mexico ($ 3815.56). Although there is no consensus on the major cost driver, all included studies described that the medications (treatment) consumed over 30% of the total cost. A high rate of inappropriate prescription drugs was observed. Conclusion: The present study highlighted how RSV infection represents a substantial economic burden to health care systems and to society. The findings of the included studies suggest a possible association between baseline risk status and expenditures. Moreover, it was observed that an important amount of the cost is destinated to treatments that have no evidence or support in most clinical practice guidelines.

Expression of TLR3 in human adenocarcinoma of the lung cells induced by respiratory syncytial virus and its significance in the diagnosis of pneumonia in children / 中国医师杂志

Objective:To study the expression of Toll like receptor 3 (TLR3) in human adenocarcinoma of the lung cells induced by respiratory syncytial virus (RSV) and its significance in the diagnosis of pneumonia in children.Methods:A549 cells were divided into RSV infection group [added 1 μg/ml Lipopolysaccharide (TLR3 agonist) transfected RSV virus after 150 μl intervention], Lipopolysaccharide stimulation group (added 1 μg/ml Lipopolysaccharide 150 μl intervention) and normal control group (normal culture). The mRNA expressions of tumor necrosis factor-α, interleukin 8, TLR3 protein and TLR3 in A549 Cells of different groups were compared. We prospectively selected 80 children with RSV infectious pneumonia admitted to Baoding Second Central Hospital from August 2019 to October 2021 as the RSV pneumonia group, and sixty children with common pneumonia were taken as the common pneumonia group, and 60 healthy children in our hospital were taken as the control group. The mRNA expression of serum TLR3 in different groups was compared, and the diagnostic efficacy of serum TLR3 in RSV pneumonia was evaluated by receiver operating characteristic.Results:There was a statistically significant difference in the expression of TLR3 protein among different groups of A549 cells ( P<0.001). The expression differences of TLR3 mRNA in different groups of A549 cells at different time points were statistically significant(all P<0.001). There was significant difference in the expression of tumor necrosis factor-α and interleukin 8 of A549 cells at different time points in different groups (all P<0.05). There was a statistically significant difference in the expression of serum TLR3 mRNA among the three groups of subjects ( F=155.237, P<0.001). The critical value for TLR3 gene diagnosis was 66.87, with corresponding sensitivity of 73.75%, specificity of 70.83%, and the area under curve (AUC) of 0.803(95% CI: 0.753-0.855). Conclusions:Respiratory syncytial virus induces human lung cancer cells and promotes disease progression through TLR3 expression; Serum TLR3 can be used for the diagnosis of RSV pneumonia.

Influencing factors of severe pneumonia in children with respiratory syncytial virus infection / 中国医师杂志

Objective:To explore the influencing factors of severe pneumonia in children with respiratory syncytial virus (RSV) infection.Methods:A retrospective case-control study was used to collect 210 children with RSV infected pneumonia admitted to Hebei Children′s Hospital from October 2017 to October 2020. Among them, 70 children with severe pneumonia were included in the severe pneumonia group, and 140 children with common pneumonia were included in the common pneumonia group; the baseline data and relevant laboratory indicators of the two groups were compared; Logistic regression was used to analyze the influencing factors of severe pneumonia in children infected with RSV.Results:The proportions of wheezing, congenital heart disease, respiratory failure, heart failure and pleural effusion of children in severe pneumonia group were higher than those in common pneumonia group, and the forced vital capacity (FVC) and forced expiratory volume in the first second (FEV 1) were lower than those in common pneumonia group (all P<0.05); the levels of C-reactive protein (CRP), CD8 + cells, RSV load and Beclin-1 in severe pneumonia group were higher than those in common pneumonia group, and the levels of CD4 + cells and 1, 25-dihydroxyvitamin D [1, 25-(OH) 2D] were lower than those in common pneumonia group (all P<0.05). After treatment, the levels of CRP, CD8 + cells and Beclin-1 in children with severe pneumonia were lower than those before treatment, and the levels of CD4 + cells and 1, 25-(OH) 2D were higher than those before treatment (all P<0.05). Multiple regression model analysis was established. The results showed that congenital heart disease, high CRP level, high CD8 + cells, high RSV load and high Beclin-1 level were risk factors for severe pneumonia in children with RSV infected pneumonia (all OR>1, P<0.05), and high CD4 + cells and 1, 25-(OH) 2D level were protective factors (all OR<1, P<0.05). Conclusions:Severe pneumonia in children with RSV infected pneumonia may be affected by congenital heart disease, CRP, CD4 + cells, CD8 + cells, 1, 25-(OH) 2D, RSV load and Beclin-1.

Virus respiratorios detectados a través de biología molecular en niños hospitalizados por Infección respiratoria aguda en tiempos de SARS-CoV-2/COVID-19 / Respiratory viruses detected through molecular biology in childrenhospitalized for acute respiratory infection in times of SARS-CoV-2 / COVID-19

Resumen Introducción: las infecciones respiratorias agudas virales se consideran una de las principales causas de mortalidad y morbilidad en pediatría, El Síndrome Respira torio Agudo Severo o Grave 2 (SARS-CoV-2), se ha convertido en un importante problema para la salud pública mundial por su alta transmisibilidad, el objetivo del estudio es describir el comportamiento de los virus respiratorios detectados por RT-PCR en niños hospitalizados por infección respiratoria aguda (IRA) en tiempos de SARS-CoV-2/COVID-19 en un centro de atención pediátrica de Cali-Colombia. Metodología: Estudio observacional de corte transversal retrospectivo, donde se evaluaron 113 pacientes mayores de 28 días y menores de 18 años entre marzo y noviembre del 2020, hospitalizados con diagnostico confirmado IRA y con Reacción en cadena de la polimerasa en tiempo Real (RT-PCR) positiva para virus respiratorios. Resultados: Predominio del género masculino (64.6%). en 74.3% se diagnosticó con IRA baja, los principales síntomas fueron tos en 92% y fiebre 74.3% Se identificó SARS-CoV-2 en 53%, Human Rhinovirus/Enterovirus en 27.41% y Virus Respiratorio Sincitial en 15%. El 34.5% de los pacientes requirieron unidad de cuidados intensivos y 15.9% ventilación mecánica Conclusiones: La infección por SARS-CoV-2 fue más común en los pacientes hospitalizados tanto en salas generales como en la unidad de cuidados intensivos pediátricos

Abstract Introduction: viral acute respiratory infections have been considered of the main causes of mortality and morbidity in pediatrics, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which has become an important problem for global public health for its high transmissibility. The objective of the study is to describe the behavior of respiratory viruses detected by RT-PCR in children hospitalized for acute respiratory infection (ARI) in times of SARS-CoV-2 / COVID19 in pediatric care center in Cali Colombia Methodology: observational with a retrospective cross-sectional study. 113 patients older than 28 days and under 18 years in March to November 2020, hospita lized with a confirmed diagnosis of ARI and Real Time Polymerase Chain Reaction (RT-PCR) positive for respiratory viruses. Results: Predominance of gender male 64.6%. 74.3% with a diagnosis of low ARI, main symptoms presented were cough 92% and fever 74.3%, SARS-CoV-2 identified 53%, Human Rhinovirus / Enterovirus 27.41% and Respiratory Syncytial Virus 15%. 34.5% of the patients required an intensive care unit with mechanical ventilation requirement 15.9% Conclusions: infection by SARS-CoV-2 was more common in hospitalized patients in both general wards as in the pediatric intensive care unit.

Infección por virus sincicial respiratorio. Reporte de casos de pacientes en área crítica pediátrica de un hospital del norte de Perú / Respiratory syncytial virus infection. Case report of patients in the critical pediatric area of a hospital in northern Perú

Introducción: El Virus sincicial respiratorio (VSR) responsable de neumonía y causa de hospitalización en áreas críticas pediátricas, puede ocasionar muertes en lactantes. Reporte de caso: Se analizaron cinco casos infrecuentes a nivel estacional en un hospital al norte de Perú durante el periodo de abril a junio del 2019, donde se observaron pacientes con neumonía causados por VSR, confirmado por inmunofluorescencia directa, radiografía de tórax y con presencia de hallazgos clínicos asociados hepatomegalia y atelectasia. De los 05 casos: 4 correspondieron a niños y una niña, en edades comprendidas de 2-7 meses, todos fueron hospitalizados, presentaron sibilancias, crepitantes y politiraje como signos prevalentes al ingreso, todos desarrollaron cuadro de neumonía severa y complicaciones, se registraron dos defunciones en menores de 6 meses, con complicaciones de sepsis, PARDS y ventilación mecánica. Conclusión: los casos presentados reflejan cuadros clínicos característicos de la enfermedad, neumonía y atelectasia en lactantes, complicaciones como SOB, PARDS y hepatomegalia.

Background: The respiratory syncytial virus (RSV) responsible for pneumonia and cause of hospitalization in critical pediatric areas, can cause deaths in infants. Report of case: Five infrequent cases were analyzed at a seasonal level in a hospital in northern Peru during the period from April to June 2019, where patients with pneumonia caused by RSV were observed, confirmed by direct immunofluorescence, chest radiography and with the presence of associated clinical findings hepatomegaly and atelectasis. Of the 05 cases: 4 correspond to boys and a girl, aged 2-7 months, all were hospitalized, presented wheezing, crackles and polytirage as prevalent signs at admission, all developed severe pneumonia and complications, were recorded two deaths in children under 6 months of age, with complications of sepsis, PARDS, and mechanical ventilation. Conclusion: the cases reflect characteristic clinical pictures of the disease, pneumonia and atelectasis in infants, complications such as SOB, PARDS and hepatomegaly.

Application value of tidal lung function combined with fractional exhaled nitric oxide in children with respiratory syncytial virus pneumonia / 中国医师进修杂志

Objective:To explore the application value of tidal lung function combined with fractional exhaled nitric oxide (FeNO) in children with respiratory syncytial virus (RSV) pneumonia.Methods:The clinical data of 65 children with RSV pneumonia in Shanghai Pudong New Area Gongli Hospital from April 2019 to October 2020 were retrospectively collected. According to the pneumonia severity index (PSI), they were divided into severe group (PSI score>130 points, 19 cases), mild to moderate group (PSI score ≤130 points, 46 cases), and 72 healthy children in the same period were selected as the normal control group. The levels of interleukin (IL)-8, IL-6, tumor necrosis factor-α(TNF-α), high-sensitivity C-reactive protein (hs-CRP) and tidal lung function parameters and FeNO were compared among the three groups and analyzed their correlation and evaluated the value in disease severity.Results:The level of FeNO in the severe group was higher than that in the mild to moderate group and the normal control group: (23.04 ± 5.49) ppb vs. (15.75 ± 8.24), (9.28 ± 3.51) ppb; the levels of tidal volume per kilogram of body mass (VT/kg), peak time ratio (TPEF/TE), peak volume ratio (VPEF/VE) in the severe group were lower than those in the mild to moderate group and the normal control group: (6.21 ± 1.89) ml/kg vs. (8.40 ± 1.27), ( 9.39 ± 3.04) ml/kg; (16.39 ± 6.61)% vs. (21.72 ± 5.39)%, (38.65 ± 7.20)%; (22.81 ± 6.39)% vs. (25.62 ± 5.30)%, (39.67 ± 4.04)% , there were statistical differences ( P<0.05). The correlation analysis results showed that the VT/kg, TPEF/TE, VPEF/VE were negatively correlated with IL-6 ( r = - 0.584, - 0.519, - 0.528; P<0.01), IL-8 ( r = - 0.521, - 0.542, - 0.567; P<0.01), TNF-α ( r = - 0.559, - 0.534, - 0.572; P<0.01) and hs-CRP ( r = - 0.528, - 0.567, - 0.533; P<0.01); the level of FeNO was positively correlated with IL-6, IL-8, TNF-α, hs-CRP ( r = 0.672, 0.639, 0.641, 0.672; P<0.01); the levels of VT/kg, TPEF/TE, VPEF/VE were negatively correlated with PSI scores in children with RSV pneumonia ( r = - 0.842, - 0.713, - 0.741; P<0.05); the level of FeNO was positively correlated with PSI scores in children with RSV pneumonia ( r = 0.809, P<0.05). The area under the curve of VT/kg, TPEF/TE, VPEF/VE combined with FeNO to assess the severity of RSV pneumonia in children with RSV pneumonia was 0.888, and the sensitivity and specificity were 73.68% and 91.30%, respectively. Conclusions:Tidal lung function parameters and FeNO are closely related to the severity of RSV pneumonia. The combined detection can be used as an objective basis for assessing the severity of RSV pneumonia.

Evaluation of respiratory complications in a cohort of preterm infants who did not receive palivizumab monoclonal antibodies / Evaluación de complicaciones respiratorias en cohorte de prematuros no contemplados con el anticuerpo monoclonal palivizumab / Avaliação das intercorrências respiratórias em coorte de prematuros não contemplados com o anticorpo monoclonal palivizumabe

ABSTRACT Objectives: to analyze the occurrence of respiratory complications over the first year of life in preterm infants who did not receive palivizumab monoclonal antibodies. Methods: analytical retrospective cohort study with preterm infants born between 2012 and 2016 in Uberlândia, state of Minas Gerais, Brazil. Data collection occurred from January to November 2018, by consulting hospital and primary healthcare medical records. Data were processed with the Poisson regression model, with p<0.05. Results: of a total of 5,213 preterm births, 504 (9.7%) met the inclusion criteria. The preterm infants in this subset were assisted 2,899 times in primary care, which resulted in 1,098 (37.5%) medical diagnoses, of which 803 (78.5%) involved the respiratory tract. Preterm babies fed on formula milk at hospital discharge had more diagnoses of respiratory diseases. Maternal age (p=0.039), respiratory diagnosis at hospital discharge (p=0.028), and number of sporadic appointments (p<0.001) showed a significant association with bronchiolitis; number of sporadic appointments showed a significant association with occurrence of respiratory diseases; and breastfeeding had a protective effect against the development of bronchiolitis. Conclusions: preterm infants who did not receive palivizumab showed a high percentage of respiratory diseases, and breastfeeding helped protect them against bronchiolitis. It is recommended that these preterm babies be monitored in primary health care.

RESUMEN Objetivos: investigar complicaciones respiratorias en el primer año de vida de prematuros no contemplados con anticuerpo monoclonal palivizumab. Métodos: estudio de cohorte retrospectivo, analítico, con prematuros nacidos entre 2012 y 2016 en Uberlândia, MG. Datos recolectados de enero a noviembre de 2018 en historias clínicas hospitalarias y de atención básica. Se utilizó modelo de regresión de Poisson, considerándose p<0,05. Resultados: de 5.513 nacimientos prematuros, 504 (9,7%) atendieron criterios; estos prematuros recibieron 2.899 consultas en atención básica; 1.098 (37,5%) con diagnóstico médico; 803 (78,5%) del tracto respiratorio. Prematuros con fórmula láctea al alta hospitalaria recibieron más diagnósticos de enfermedades respiratorias. Edad materna (p=0,039), diagnóstico respiratorio al alta (p=0,028), cantidad de consultas eventuales (p<0,001) mostraron asociación significativa con bronquiolitis. Conclusiones: prematuros sin palivizumab mostraron elevado porcentaje de enfermedades respiratorias; se observó efecto protector de la lactancia materna. Se recomienda el seguimiento de dichos prematuros en atención primaria.

RESUMO Objetivos: investigar intercorrências respiratórias no primeiro ano de vida de prematuros não contemplados com anticorpo monoclonal palivizumabe. Métodos: estudo de coorte retrospectivo, analítico, com prematuros nascidos entre 2012 e 2016, em Uberlândia, MG. Coleta realizada de janeiro a novembro de 2018, em prontuários hospitalar e da atenção básica. Utilizou-se modelo de regressão de Poisson; considerou-se p<0.05. Resultados: de 5.213 nascimentos prematuros, 504 (9,7%) atenderam os critérios; esses prematuros tiveram 2.899 atendimentos na atenção básica; 1.098 (37,5%) com diagnóstico médico, 803 (78,5%) do trato respiratório. Prematuros com fórmula láctea na alta hospitalar tiveram mais diagnósticos de doenças respiratórias. Idade materna (p=0,039), diagnóstico respiratório na alta (p=0,028), número de consultas eventuais (p<0,001) apresentaram associação significativa com bronquiolite. Consultas eventuais foram significantes para doenças respiratórias; o aleitamento materno mostrou-se protetor para bronquiolite. Conclusões: prematuros sem palivizumabe apresentaram elevado percentual de doenças respiratórias; observou-se efeito protetor do aleitamento materno. Recomenda-se vigilância desses prematuros na atenção primária.

Epidemiological study of respiratory syncytial virus-associated acute lower respiratory tract infection in hospitalized children in Shanghai / 中华传染病杂志

Objective:To investigate the epidemiological characteristics of hospitalized children with respiratory syncytial virus (RSV)-associated acute lower respiratory tract infection (ALRTI), and to analyzed the risk factors for severe infection.Methods:The epidemiological and clinical data of hospitalized children with ALRTI and positive RSV test from Children′s Hospital of Fudan University from January 2013 to December 2018 were retrospectively analyzed.The hospitalized children from October 2016 to November 2017 were selected by random singular sequence and divided into severe infection group and non-severe infection group. The clinical data of the two groups were compared. Multivariate logistic regression analysis was used to analyze the risk factors of severe RSV-associated ALRTI.Results:A total of 34 192 hospitalized children were diagnosed with ALRTI, and 8 113(23.73%) children were positive for respiratory tract viruses, including 4 028(11.78%) children with RSV infection, which was higher than other common respiratory tract viruses. Among the 4 028 RSV-positive children, 2 550(63.31%) were under six months of age, 3 623(89.95%) were under two years of age. The detection rates of RSV in spring, summer, autumn and winter were 6.47%(553/8 551), 2.46%(176/7 161), 12.85%(1 042/8 111) and 21.77%(2 257/10 369), respectively. In 347 hospitalized children with RSV-associated ALRTI, 54 cases were severe cases. Multivariate logistic regression analysis showed that RSV-positive patients complicated with respiratory diseases ( Z=3.43), cardiovascular diseases ( Z=4.96), non-exclusive breast-feeding ( Z=-1.97) and premature birth ( Z=-1.98) were independent risk factors for severe RSV-associated ALRTI (all P<0.050). Conclusions:RSV is the most important and common viral pathogen in hospitalized children with ALRTI in Shanghai, and infants under six months of age are the most susceptible to RSV. RSV patients complicated with respiratory diseases, cardiovascular diseases, non-exclusive breast-feeding and premature birth are more likely to develope severe RSV-associated ALRTI.

Investigation on outbreaks of acute respiratory tract infection caused by respiratory syncytial virus in kindergartens in Hangzhou / 中国学校卫生

Objective@#In order to analyze the characteristics of the outbreak of acute respiratory tract infection in children caused by respiratory syncytial virus(RSV).@*Methods@#The field epidemiological investigations were conducted for the two outbreaks in kindergartens in Hangzhou. Data were analyzed by descriptive method. Samples with positive respiratory syncytial virus nucleic acid were sequenced using PCR.@*Results@#The two outbreaks occurred in kindergartens. There were 21 cases in kindergarten A, lasting 11 days, and 43 cases in kindergarten B, lasting 33 days. The epidemic curve showed a proliferation pattern. The cases were concentrated in nurseries and K1 classes, primarily among children aged 2-4 years. The most common symptoms were fever and cough, mainly upper respiratory tract infection, and no severe cases were found. Upper respiratory tract samples were collected and detected as positive for RSV. Four samples were sequenced and identified as subgroup B.@*Conclusion@#During the outbreak of acute respiratory infection in kindergartens, respiratory syncytial virus should be given primary consideration in the process of identification of the outbreak caused by other respiratory infections, and strictly control measures should be taken to reduce the long term impact of the epidemic.

Infección respiratoria aguda viral en dos instituciones del departamento de Boyacá, durante los años 2016-2017 / Acute viral respiratory infection in two institutions of the state of Boyacá, during 2016-2017

Resumen Introducción: La infección por virus respiratorios es la causa más frecuente de consulta médica en el mundo. Puede asociarse con manifestaciones clínicas diversas, desde cuadros menores y auto limitados de la vía aérea superior hasta formas graves que comprometen la vía aérea inferior como la neumonía adquirida en la comunidad. Objetivo: Determinar la prevalencia de infección por virus respiratorios en dos instituciones de Boyacá 2016-2017. Metodología: Estudio de corte transversal. Se incluyeron las muestras de pacientes que fueron enviadas por dos unidades primarias generadoras de datos al programa de vigilancia centinela de virus respiratorios del departamento de Boyacá. Se realizó tamizaje por inmunofluorescencia indirecta para la detección de virus de influenza A y B, parainfluenza 1, 2 y 3, adenovirus, virus sincitial respiratorio y metapneumovirus. Resultados: Se incluyeron 614 muestras. La positividad para virus fue 22,8 %. Los virus respiratorios más identificados fueron virus sincitial respiratorio 66,0 %, seguido por influenza 8,7 %, metaneumovirus 8,6 %, adenovirus 8,6 % y parainfluenza 8,1 %. Se presentó co-infección por dos virus en 7,7 % de las muestras. De los pacientes positivos, el 50,7 % correspondieron al sexo femenino y el 83,5 % eran menores de cinco años. Los datos clínicos más frecuentes fueron tos 89,2 %, fiebre 87,8 %, rinorrea 58,5 % y odinofagia 56,4 %. Conclusiones: La vigilancia desarrollada por el Laboratorio de Salud Pública de Boyacá contribuye al conocimiento de la circulación de agentes virales y es importante para iniciar las medidas de prevención, control y mitigación para disminuir el impacto de la infección respiratoria aguda en el departamento.

Abstract Introduction: Respiratory viral infection is the most frequent cause of medical appointment in the world. It can be associated with various clinical manifestations, from minor and self-limited upper airway cases to severe forms that compromise the lower airway such as community acquired pneumonia. Objective: Determine the prevalence of respiratory virus infection in the state of Boyacá 2016-2017. Methodology: This cross-sectional study included samples of patients that were sent by two primary data generating units to the sentinel surveillance program for respiratory viruses in the department of Boyacá. Indirect immunofluorescence screening was performed for the detection of influenza A and B viruses, parainfluenza 1, 2 and 3, adenovirus, respiratory syncytial virus and metapneumovirus. Results: 614 samples were included. Virus positivity was 22.8%. The most identified respiratory viruses were respiratory syncytial virus 66.0%, followed by influenza 8.7%, metapneumovirus 8.6%, adenovirus 8.6% and parainfluenza 8.1%. There was co-infection by two viruses in 7.7% of the samples. Of the positive patients, 50.7% were female and 83.5% were under five years of age. The most frequent clinical data were cough with 89.2%, fever 87.8%, runny nose 58.5% and odynophagia with 56.4%. Conclusions: The surveillance developed by the Public Health Laboratory of Boyacá contributes to the knowledge of the circulation of viral agents and is important to initiate prevention, control and mitigation measures to reduce the impact of acute respiratory infection in the state.

Infección respiratoria aguda viral en dos instituciones del departamento de Boyacá, durante los años 2016-2017 / Acute viral respiratory infection in two institutions of the state of Boyacá, during 2016-2017

Resumen Introducción: La infección por virus respiratorios es la causa más frecuente de consulta médica en el mundo. Puede asociarse con manifestaciones clínicas diversas, desde cuadros menores y auto limitados de la vía aérea superior hasta formas graves que comprometen la vía aérea inferior como la neumonía adquirida en la comunidad. Objetivo: Determinar la prevalencia de infección por virus respiratorios en dos instituciones de Boyacá 2016-2017. Metodología: Estudio de corte transversal. Se incluyeron las muestras de pacientes que fueron enviadas por dos unidades primarias generadoras de datos al programa de vigilancia centinela de virus respiratorios del departamento de Boyacá. Se realizó tamizaje por inmunofluorescencia indirecta para la detección de virus de influenza A y B, parainfluenza 1, 2 y 3, adenovirus, virus sincitial respiratorio y metapneumovirus. Resultados: Se incluyeron 614 muestras. La positividad para virus fue 22,8 %. Los virus respiratorios más identificados fueron virus sincitial respiratorio 66,0 %, seguido por influenza 8,7 %, metaneumovirus 8,6 %, adenovirus 8,6 % y parainfluenza 8,1 %. Se presentó co-infección por dos virus en 7,7 % de las muestras. De los pacientes positivos, el 50,7 % correspondieron al sexo femenino y el 83,5 % eran menores de cinco años. Los datos clínicos más frecuentes fueron tos 89,2 %, fiebre 87,8 %, rinorrea 58,5 % y odinofagia 56,4 %. Conclusiones: La vigilancia desarrollada por el Laboratorio de Salud Pública de Boyacá contribuye al conocimiento de la circulación de agentes virales y es importante para iniciar las medidas de prevención, control y mitigación para disminuir el impacto de la infección respiratoria aguda en el departamento.

Abstract Introduction: Respiratory viral infection is the most frequent cause of medical appointment in the world. It can be associated with various clinical manifestations, from minor and self-limited upper airway cases to severe forms that compromise the lower airway such as community acquired pneumonia. Objective: Determine the prevalence of respiratory virus infection in the state of Boyacá 2016-2017. Methodology: This cross-sectional study included samples of patients that were sent by two primary data generating units to the sentinel surveillance program for respiratory viruses in the department of Boyacá. Indirect immunofluorescence screening was performed for the detection of influenza A and B viruses, parainfluenza 1, 2 and 3, adenovirus, respiratory syncytial virus and metapneumovirus. Results: 614 samples were included. Virus positivity was 22.8%. The most identified respiratory viruses were respiratory syncytial virus 66.0%, followed by influenza 8.7%, metapneumovirus 8.6%, adenovirus 8.6% and parainfluenza 8.1%. There was co-infection by two viruses in 7.7% of the samples. Of the positive patients, 50.7% were female and 83.5% were under five years of age. The most frequent clinical data were cough with 89.2%, fever 87.8%, runny nose 58.5% and odynophagia with 56.4%. Conclusions: The surveillance developed by the Public Health Laboratory of Boyacá contributes to the knowledge of the circulation of viral agents and is important to initiate prevention, control and mitigation measures to reduce the impact of acute respiratory infection in the state.

Risk factors for recurrent wheezing in preterm infants who received prophylaxis with palivizumab / Fatores de risco para sibilância recorrente em crianças pré-termo que receberam profilaxia com palivizumabe

ABSTRACT Objective: To determine the prevalence of recurrent wheezing (RW) in preterm infants who received prophylaxis against severe infection with respiratory syncytial virus (RSV) and to identify genetic susceptibility (atopy or asthma) and risk factors for RW. Methods: This was a cross-sectional study involving preterm infants who received prophylaxis with palivizumab at a referral center in Brazil during the first two years of age. A structured questionnaire was administered in a face-to-face interview with parents or legal guardians. Results: The study included 410 preterm infants (median age = 9 months [0-24 months]). In the sample as a whole, 111 children (27.1%; [95% CI, 22.9-31.5]) had RW. The univariate analysis between the groups with and without RW showed no differences regarding the following variables: sex, ethnicity, maternal level of education, gestational age, birth weight, breastfeeding, number of children in the household, day care center attendance, pets in the household, and smoking caregiver. The prevalence of RW was twice as high among children with bronchopulmonary dysplasia (adjusted OR = 2.08; 95% CI, 1.11-3.89; p = 0.022) and almost five times as high among those with a personal/family history of atopy (adjusted OR = 4.96; 95% CI, 2.62-9.39; p < 0.001) as among those without these conditions. Conclusions: Preterm infants who received prophylaxis with palivizumab but have a personal/family history of atopy or bronchopulmonary dysplasia are more likely to have RW than do those without these conditions.

RESUMO Objetivo: Determinar a prevalência de sibilância recorrente (SR) em crianças pré-termo que receberam profilaxia contra infecção grave pelo vírus sincicial respiratório (VSR) e identificar susceptibilidade genética (atopia ou asma) e fatores de risco para SR. Métodos: Estudo transversal envolvendo crianças pré-termo que receberam profilaxia com palivizumabe em um centro de referência no Brasil durante os primeiros dois anos de vida. Um questionário estruturado foi aplicado em entrevista presencial com os pais ou responsáveis. Resultados: O estudo incluiu 410 crianças pré-termo (mediana de idade = 9 meses [0-24 meses]). Na amostra total, 111 crianças (27,1%; IC95%: 22,9-31,5) apresentavam SR. A análise univariada entre os grupos com e sem SR não mostrou diferenças em relação às seguintes variáveis: sexo, etnia, escolaridade materna, idade gestacional, peso ao nascer, aleitamento materno, número de crianças no domicílio, frequência em creche, presença de animais de estimação no domicílio e cuidador tabagista. A prevalência de SR foi duas vezes maior entre crianças com displasia broncopulmonar (OR ajustada = 2,08; IC95%: 1,11-3,89; p = 0,022) e quase cinco vezes maior entre aquelas com história pessoal/familiar de atopia (OR ajustada = 4,96; IC95%: 2,62-9,39; p < 0,001) do que entre aquelas sem essas condições. Conclusões: Crianças pré-termo que receberam profilaxia com palivizumabe, mas apresentam história pessoal/familiar de atopia ou displasia broncopulmonar, têm maior probabilidade de apresentar SR do que aquelas sem essas condições.

Conditions of vulnerability to the inadequate treatment of bronchiolitis

SUMMARY OBJECTIVE To analyze clinical and demographic variables possibly associated with the prescriptions of non-recommended but routinely used therapies for infants with acute viral bronchiolitis. METHODS A cross-sectional study included hospitalized infants with bronchiolitis caused by the respiratory syncytial virus. Those with other associated infections and/or morbidities were excluded. The data were collected from medical records. RESULTS Among 120 cases, 90% used inhaled beta-agonists, 72.5% corticosteroids, 40% antibiotics, and 66.7% inhaled hypertonic saline solution. The use of bronchodilators did not present an independent association with another variable. More frequent use of corticosteroids was associated with low oximetry, longer hospitalization time, and age>3 months. Antibiotic therapy was associated with the presence of fever, longer hospitalization, and age>3 months. Inhaled hypertonic saline solution was associated with longer hospitalization time. CONCLUSIONS Non-recommended prescriptions were frequent. Corticosteroid and antibiotic therapy were associated with signs of severity, as expected, but interestingly, they were more frequently used in infants above 3m, which suggested less safety in the diagnosis of viral bronchiolitis in these patients. The use of bronchodilators was even more worrying since they were indiscriminately used, without association with another variable related to the severity or characteristics of the host. The use of the inhaled hypertonic solution, although not associated with severity, seems to have implied a longer hospitalization time. The identification of these conditions of greater vulnerability to the prescription of inappropriate therapies contributes to the implantation of protocols for the bronchiolitis treatment, for continuing education and for analysis of the effectiveness of the strategies employed.

RESUMO OBJETIVOS Analisar variáveis clínicas e demográficas possivelmente associadas às prescrições de terapêuticas não recomendadas, porém rotineiramente utilizadas, para lactentes com bronquiolite viral aguda. MÉTODOS Estudo transversal incluiu lactentes hospitalizados com bronquiolite por vírus sincicial respiratório. Excluídos aqueles com outras infecções e/ou morbidades. Dados coletados de prontuários. RESULTADOS Analisados 120 casos, para os quais foram prescritos: beta-agonistas inalatórios a 90%; corticosteroides a 72,5%, antibióticos a 40% e solução salina hipertônica inalatória a 66,7%. O uso de broncodilatadores não apresentou associação independente com outra variável. Maior uso de corticosteroide associou-se à baixa oximetria, maior tempo de internação e idade >3 meses. Antibioticoterapia associou-se à presença de febre, maior tempo de internação e idade >3 meses. Solução salina hipertônica inalatória associou-se a maior tempo de internação. CONCLUSÕES A frequência das prescrições não recomendadas foi elevada. Corticosteroide e antibioticoterapia foram associados a sinais de gravidade, como esperado, porém, interessantemente, foram mais utilizados nos lactentes com idade acima de 3 meses, o que sugeriu menor segurança no diagnóstico de bronquiolite viral nesses pacientes. O uso de broncodilatadores foi ainda mais preocupante, uma vez que foram indiscriminadamente utilizados, sem associação com outra variável, seja relacionada à gravidade, seja a características do hospedeiro. O uso de solução hipertônica inalatória, apesar de não associado à gravidade, parece ter implicado maior tempo de internação. A identificação dessas condições de maior vulnerabilidade à prescrição de terapêuticas inadequadas contribui para a implantação de protocolos para o tratamento da BVA, para educação continuada e para posteriores comparações e análises de eficácia das estratégias empregadas.

Serum levels of interleukin-18, interleukin-33 and fractional exhaled nitric oxide in children with acute respiratory syncytial virus bronchiolitis / 中国医师进修杂志

Objective To observe the changes of interleukin-18 (IL-18),interleukin-33 (IL-33) and fractional exhaled nitric oxide (FeNO) in children with acute respiratory syncytial virus (RSV) bronchiolitis,and explore the potential mechanism of the transformation from acute RSV bronchiolitis to recurrent wheezing.Methods Fifty-three children with RSV bronchiolitis (RSV bronchiolitis group),32 children with repeated wheeze (repeated wheeze group) and 30 children receiving regular physical examination (healthy control group) from January 2016 to January 2017 in Cangzhou People's Hospital of Hebei Province were selected.The serum IL-18 and IL-33 at the time of inclusion and 2,3 months after inclusion were detected by enzyme linked immunosorbent assay,the FeNO at the same time was detected by multiple breathing technique,and the indexes were compared.The correlation between FeNO and IL-33,IL-18 was analyzed by Spearman method.Results The IL-18 at the time of inclusion and 2,3 months after inclusion in RSV bronchiolitis group and repeated asthmatic group were significantly higher than those in healthy control group:(10.89 ± 1.54) and (14.86 ± 5.54) ng/L vs.(7.26 ± 3.25) ng/L,(13.74 ± 4.16) and (15.45 ± 5.75) ng/L vs.(7.28 ± 3.56) ng/L,(11.38 ± 6.21) and (14.86 ± 5.28) ng/L vs.(7.18 ± 3.41) ng/L,those in repeated asthmatic group were significantly higher than those in RSV bronchiolitis group,and there were statistical differences (P＜0.05).The IL-33 levels at the time of inclusion and 2,3 months after inclusion in RSV bronchiolitis group and repeated asthmatic group were significantly higher than those in healthy control group:(17.68 ± 5.25) and (13.14 ± 5.01) ng/L vs.(3.69 ± 1.61) ng/L,(15.68 ± 4.16) and (15.11 ± 5.24) ng/L vs.(3.28 ± 1.56) ng/L,(13.87 ± 6.21) and (14.11 ± 5.14) ng/L vs.(3.18 ± 1.41) ng/L,IL-33 levels at the time of inclusion in RSV bronchiolitis group were significantly higher than those in repeated asthmatic group,and there were statistical differences (P＜0.05).The FeNO levels at the time of inclusion and 2,3 months after inclusion in repeated asthmatic group were significantly higher than those in RSV bronchiolitis group and healthy control group:(13.14 ± 4.47) ppb vs.(1.89 ± 1.54) and (7.26 ± 4.25) ppb,(14.75 ± 5.15) ppb vs.(7.74 ± 4.16) and (7.28 ± 4.12) ppb,(13.68 ± 5.62) ppb vs.(11.38 ± 6.21) and (7.18 ± 3.41) ppb;compared with that in healthy control group,FeNO at the time of inclusion in RSV bronchiolitis group was significantly decreased,and at 3 months was significantly increased,and there were statistical differences (P＜0.05).Correlation analysis result showed that FeNO at 2 and 3 months after inclusion in RSV bronchiolitis group had positive correlation with IL-18 level at the time of inclusion and 2,3 months after inclusion (P＜0.05),and negative correlation with IL-33 (P＜0.05);FeNO at 2 and 3 months after inclusion in repeated asthmatic group showed positive correlation with IL-18 at the same time (P＜0.05),and was negatively correlated with IL-33 level (P＜0.05);there was no correlation between FeNO and IL-18,IL-33 in healthy control group (P＞0.05).Conclusions IL-18 and IL-33 may be involved in the pathogenesis of acute RSV bronchiolitis and recurrent wheezing,and the concentration of IL-18 and IL-33 is correlated with the level of FeNO.Its potential mechanism needs further study.

Prevalencia de microorganismos patógenos respiratorios durante dos temporadas consecutivas de virus sincicial respiratorio en un centro de atención de alta complejidad / Prevalence of respiratory pathogens during two consecutive respiratory syncytial virus seasons at a tertiary medical care center

Objetivo. Determinar el perfil etiológico de la infección de vías respiratorias bajas (IVRB) en los neonatos durante la temporada de virus sincicial respiratorio (VSR) y definir las características de esta y otras infecciones. Métodos. Estudio retrospectivo con neonatos hospitalizados por IVRB durante dos temporadas de VSR, con reacción múltiple en cadena de la polimerasa en tiempo real. Se revisaron los datos relevantes y se compararon las características de la infección por VSR con las de otros microorganismos. Resultados. Entre 224 pacientes, 160 (71 %) fueron positivos para, al menos, un agente causal potencial. Entre ellos, el 65 % tenía VSR y el 15 %, más de un agente (coinfección). En el grupo con VSR, hubo más dificultad respiratoria (p < 0,01), radiografías de tórax anormales (p < 0,01), requerimiento de atención en terapia intensiva (p < 0,01) y más días de oxigenoterapia (p < 0,01). No obstante, hubo menos casos de fiebre al ingreso y menos días de antibioticoterapia (en ambos, p < 0,01), y la duración de la hospitalización no fue más prolongada. Los pacientes con coinfección requirieron atención en terapia intensiva en mayor medida que los demás (25 % contra 6,5 %, p < 0,01). Conclusión. Este estudio demostró que el VSR fue más frecuente en los neonatos hospitalizados por IVRB durante la temporada y condujo a una evolución más grave que otros microorganismos patógenos detectados. Posiblemente la gravedad de la infección por VSR se viera aumentada por la presencia de una coinfección y radiografía de tórax anormal.

Aim: To determine the etiological profiles of lower respiratory tract infection (LRI) in neonates during respiratory syncytial virus(RSV) season, and to define the clinical features of RSV-related infection and others. Methods: The retrospective study included newborn infants who were hospitalized for LRI during the two consecutive RSV seasons, and then tested for possible etiological agent by multiplex real-time polymerase chain reaction. All relevant data were reviewed, and the clinical characteristics of RSV-related infection were compared to those of others. Results: Of 224 patients, 160 (71 %) were positive for at least one potentially causative agent. Of them, 65 % had RSV, and 15 % had more than on ecausative agent (co-infection). The RSV group had more the findings of respiratory distress (p< 0.01), abnormal chest radiography (p< 0.01), need for intensive care (p< 0.01), and duration of oxygen requirement (p< 0.01) but less fever on admission and duration of antibiotic use (for both, p< 0.01), and no longer hospital stay. Need of intensive care nursery was more common in patients with co-infection than others (25 % vs. 6.5 %, p< 0.01). Conclusion: This study highlighted that RSV was the most frequent agent in neonates hospitalized for LRI during the season, with a more severe clinical course than other detected pathogens. The disease severity of RSV infection may have seemed to be increased by the presence of coinfection and abnormal chest radiography.

Estudio Transversal: Prevalencia de Infecciones por Virus Sincitial Respiratorio en Pacientes Ingresados en el Hospital de Especialidades José Carrasco Arteaga, 2017 / Cross- sectional study: Prevalence of Human Respiratory Syncytial Virus Infections in Patients Admitted at the Hospital José Carrasco Arteaga, 2017

INTRODUCCIÓN: El virus sincitial respiratorio es una de las principales causas de infección respiratoria baja en pacientes menores de 5 años; constituye además una de las principales causas de mortalidad pediátrica a nivel mundial. El objetivo del presente estudio fue determinar la prevalencia de infección por virus sincitial respiratorio en pacientes ingresados en el Hospital de Especialidades José Carrasco Arteaga. METODOLOGÍA: Se realizó un estudio transversal, el universo incluyó a pacientes pediátricos con edades comprendidas entre los 0 y 5 años, que hayan sido ingresados en el Hospital de Especialidades José Carrasco Arteaga con diagnóstico de infección respiratoria baja. Se usó la inmunocromatografía como prueba para detección del virus, los datos fueron tabulados mediante el programa estadístico SPSS versión 22.0. RESULTADOS: 186 pacientes fueron incluidos en el estudio; de estos el 76.35% (n=142) fue diag-nosticado de neumonía, 19.35% (n=36) de bronquiolitis y 4.30% (n=8) de bronquitis aguda. La prevalencia de infecciones por virus sincitial respiratorio en pacientes pediátricos fue del 44% (n=82). Los factores analizados en busca de asociación con la infección fueron: edad 24 ­ 60 meses (p= 0.012), sexo masculino (p= 0.236), parto por cesárea (p= 0.853), patología crónica de base (p=0.060), esquema de vacunación incompleto (p= 0.010), lactancia materna no exclusiva (p= 0.176), tabaquismo pasivo (p= 0.609) y nivel socio económico bajo (p= 0.609). CONCLUSIÓN: La prevalencia general de infección por virus sincitial respiratorio en pacientes menores a 5 años es del 43%. De los factores analizados, la edad (24 ­ 60 meses) y el esquema de vacu-nación incompleto presentaron asociación estadísticamente significativa con la presencia de la infección. Esta investigación no reportó asociación con sexo masculino, parto por cesárea, patología crónica de base, lactancia materna incompleta, tabaquismo previo o nivel socio económico bajo.(AU)

BACKGROUND: Human Respiratory Syncytial Virus is one of the main causes of lower respiratory infections in patients under 5 years of age; it is also one of the main causes of pediatric mortality worldwide. The aim of this study was to determine the prevalence of respiratory syncytial virus infection in patients admitted to Hospital José Carrasco Arteaga. METHODS: A cross-sectional study was performed; the universe included pediatric patients between 0 and 5 years old, who had been admitted to Hospital José Carrasco Arteaga with a diagnosis of low respiratory infection. Immunochromatography was used as a test for virus detection; the data was tabulated using the statistical software SPSS version 22.0. RESULTS: 186 patients were included; 76.35% (n=142) were diagnosed with pneumonia, 19.35% (n=36) of bronchiolitis and 4.30% (n=8) of acute bronchitis. The prevalence of human respiratory syncytial virus infections in pediatric patients was 44% (n=82). The factors analyzed in search of association with the infection were: age 24 - 60 months (p= 0.012), male sex (p= 0.236), cesarean delivery (p= 0.853), chronic base pathology (p= 0.060), incomplete vaccination scheme (p= 0.010), non-exclusive breastfeeding (p= 0.176), passive smoking (p= 0.609) and low socio-economic status (p= 0.609). CONCLUSION: The overall prevalence of human respiratory syncytial virus infection in patients younger than 5 years is 43%. Of the analyzed factors, age (24 - 60 months) and incomplete vaccination scheme showed a statistically significant association with the presence of the infection. This investigation did not report association with male sex, cesarean delivery, chronic basic pathology, incomplete breastfeeding, previous smoking or low socio-economic status.

Evaluación de un método de amplificación isotérmica mediado por bucle para la detección rápida del virus sincicial respiratorio en niños con infección respiratoria aguda / Evaluation of a loop-mediated isothermal amplification method for the rapid detection of human respiratory syncytial virus in children with acute respiratory infection

Resumen Introducción. El virus sincicial respiratorio humano (hRSV) es la causa más frecuente de infección respiratoria aguda de las vías respiratorias inferiores en niños menores de cinco años. El desarrollo de técnicas moleculares para identificarlo es uno de los retos actuales en el campo de la investigación clínica. Objetivo. Evaluar un método de amplificación isotérmica para la detección rápida del hRSV en niños con infección respiratoria aguda. Materiales y métodos. Se extrajo el ARN viral de 304 muestras de hisopado nasal en niños con síntomas de infección respiratoria aguda atendidos en el servicio de urgencias del Hospital de la Universidad del Norte en Barranquilla entre abril del 2016 y julio del 2017. Se evaluó la prueba de amplificación isotérmica mediada por bucle mediante transcriptasa inversa de la proteína de la matriz (M) (Reverse Transcription Loop-Mediated Isothermal Amplification, RT-LAMP) comparada con técnicas moleculares como la reacción en cadena de la polimerasa mediante transcriptasa inversa múltiple anidada (Reverse Transcription- Polymerase Chain Reaction, RT-PCR), la cual se empleó como la prueba estándar, la PCR en tiempo real (quantitative PCR, qPCR) y la RT-LAMP de la proteína L (L) para la detección rápida del virus sincicial respiratorio (VSR), subtipo A y subtipo B. Resultados. La prueba de RT-LAMP (M) tuvo una sensibilidad de 93,59 %, una especificidad de 92,92 % y una concordancia de 0,83 ± 0,036 comparada con la prueba de RT-PCR anidada. El índice kappa del RT-LAMP (M) fue superior, y los valores del RT-LAMP (L) y la qPCR concordaron (0,75 ± 0,043 y 0,71 ± 0,045, respectivamente). Conclusiones. Estos resultados indican que la prueba RT-LAMP (M) puede considerarse como una herramienta de utilidad clínica para detectar el hSRVA, dado que el tiempo requerido para la obtención de resultados, así como los costos, es menor, y su desempeño es mejor que el de las otras pruebas moleculares evaluadas.

Abstract Introduction: Human respiratory syncytial virus (hRSV) is the most frequent cause of acute respiratory infection of the lower respiratory tract in children under the age of five. The development of molecular techniques able to identify hRSV is one of the current challenges in the field of clinical research. Objective: To evaluate the ability of an isothermal amplification method to rapidly detect hRSV in children with acute respiratory infection. Materials and methods: We collected 304 nasopharyngeal swab samples from children with symptoms of acute respiratory infection who attended the emergency unit at Hospital de la Universidad del Norte in Barranquilla from April, 2016, to July, 2017. After extracting viral RNA from the samples, we evaluated the ability of the reverse transcriptase-loop-mediated isothermal amplification (RT-LAMP) M assay to rapidly detect hRSVA and hRSVB compared to other molecular techniques: quantitative PCR (qPCR), reverse transcriptase-LAMP L assay, and as a standard, the multiplex nested reverse transcriptase polymerase chain reaction (nested RT-PCR). Results: The RT-LAMP M assay had a sensitivity of 93.59% and a specificity of 92.92%, and a concordance of 0.83 ± 0.036 as compared with the nested RT-PCR test. While the Kappa index of the RT-LAMP M assay was higher than the values for the RT-LAMP L assay and the qPCR, the values of the latter two methods were in agreement (0.75 ± 0.043 and 0.71 ± 0.045, respectively). Conclusion: Due to the shorter running times, lower costs and better performance of the RT-LAMP M assay, it can be considered as a useful clinical tool for the detection of RSVA.

Comparison of clinical severity between single- and coinfections of respiratory syncytial virus and influenza virus with common respiratory viruses

PURPOSE: Multiple virus infections may affect clinical severity. We investigated the effect of coinfection of respiratory syncytial virus (RSV) and influenza virus with other respiratory viruses on clinical severity. METHODS: Data from 634 samples of a single tertiary hospital between September 2014 and April 2015 were analyzed for clinical characteristics (fever duration and O2 need, steroid use, and ICU care) between single infection and coinfection of RSV (n=290) and influenza virus (n=74) with 16 common respiratory viruses from hospitalized children. RESULTS: The RSV coinfection group (n=109) (3.1±2.7 days) showed significantly longer fever duration than the RSV single infection group (n=181) (2.6±2.6 days) (P=0.04), while there was no difference in O2 need, steroid use or ICU care in the 2 groups. The influenza coinfection group (n=38) showed significantly higher O2 need than the influenza single infection group (n=36) (21.1% vs. 5.6%, P=0.05), while there was no difference in fever duration between the 2 groups. CONCLUSION: The results indicate that RSV and Influenza coinfections can increase clinical severity and that the severity may be influenced by the nature of coinfecting viruses.