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1.
Chinese Journal of Preventive Medicine ; (12): 203-211, 2022.
Article in Chinese | WPRIM | ID: wpr-935239

ABSTRACT

Human parainfluenza viruses (HPIVs) is one of the main causes of acute respiratory tract infections in children. HPIVs have been grouped into four serotypes (HPIV1~HPIV4) according to serological and genetic variation. Different serotypes of HPIVs have diverse clinical disease spectrum, epidemic characteristics and disease burden. Based on the nucleotide variation in structural protein genes, HPIVs can be further divided into distinct genotypes and subtypes with diverse temporal and spatial distribution features. The standard molecular typing methods are helpful to clarify the gene evolution and transmission patterns of HPIVs in the process of population transmission. However, the development of molecular epidemiology of HPIVs has been hindered by the lack of a standardized molecular typing method worldwide. Therefore, this study reviewed the viral characteristics, genome structure, existing genotyping methods and evolution of HPIVs, and screened the reference strains for molecular typing, so as to improve the understanding of gene characteristics and molecular typing of HPIVs, and provide an important scientific basis for the monitoring and research of molecular epidemiology of HPIVs in China.


Subject(s)
Child , Humans , Molecular Typing , Parainfluenza Virus 1, Human/genetics , Parainfluenza Virus 2, Human/genetics , Parainfluenza Virus 3, Human/genetics , Paramyxoviridae Infections/epidemiology , Respiratory Tract Infections/epidemiology
2.
Gac. méd. Méx ; 156(4): 263-269, Jul.-Aug. 2020. tab, graf
Article in English | LILACS | ID: biblio-1249909

ABSTRACT

Abstract Introduction: Acute respiratory infections are the second cause of mortality in children younger than five years, with 150.7 million episodes per year. Human orthopneumovirus (hOPV) and metapneumovirus (hMPV) are the first and second causes of bronchiolitis; type 2 human orthorubulavirus (hORUV) has been associated with pneumonia in immunocompromised patients. Objective: To define hOPV, hMPV and hORUV geographical distribution and circulation patterns. Method: An observational, prospective cross-sectional pilot study was carried out. Two-hundred viral strains obtained from pediatric patients were genotyped by endpoint reverse transcription polymerase chain reaction (RT-PCR). Results: One-hundred and eighty-six positive samples were typed: 84 hOPV, 43 hMPV, two hORUV and 57 co-infection specimens. Geographical distribution was plotted. hMPV, hOPV, and hORUV cumulative incidences were 0.215, 0.42, and 0.01, respectively. Cumulative incidence of hMPV-hORUV and hMPV-hOPV coinfection was 0.015 and 0.23; for hOPV-hMPV-hORUV, 0.035; and for hORUV-hOPV, 0.005. The largest number of positive cases of circulating or co-circulating viruses occurred between January and March. Conclusions: This study successfully identified circulation and geographical distribution patterns of the different viruses, as well as of viral co-infections.


Resumen Introducción: Las infecciones respiratorias agudas constituyen la segunda causa de mortalidad en los niños menores de cinco años, con 150.7 millones de episodios anuales. Entre los principales agentes etiológicos están Orthopneumovirus (hOPV) y metapneumovirus (hMPV) humanos como primera y segunda causa de bronquiolitis, respectivamente; Orthorubulavirus humano tipo 2 (hORUV) se ha asociado a neumonía en pacientes inmunocomprometidos. Objetivo: Definir patrones de distribución geográfica y de circulación de hOPV, hMPV y hORUV. Método: Se llevó a cabo un estudio piloto transversal prospectivo observacional. Se genotipificaron 200 aislamientos virales de pacientes pediátricos mediante transcripción inversa seguida de reacción en cadena de la polimerasa en punto final (RT-PCR). Resultados: Se tipificaron 186 muestras positivas: 84 de hOPV, 43 de hMPV, dos de hORUV y 57 de coinfecciones. Se trazó la distribución geográfica. Las incidencias acumuladas de hMPV, hOPV y hORUV fueron de 0.215, 0.42 y 0.01, respectivamente. Las incidencias acumuladas de la coinfección de hMPV-hORUV y hMPV-hOPV fueron de 0.015 y 0.23; de hOPV-hMPV-hORUV, de 0.035; y de hORUV-hOPV, de 0.005. El mayor número de casos positivos de virus circulantes o cocirculantes se presentó entre enero y marzo. Conclusiones: Fue posible identificar patrones de circulación y distribución geográfica de los diferentes virus, así como de las coinfecciones virales.


Subject(s)
Humans , Infant, Newborn , Infant , Child, Preschool , Child , Adolescent , Respiratory Tract Infections/epidemiology , Pneumovirus Infections/epidemiology , Paramyxoviridae Infections/epidemiology , Reverse Transcriptase Polymerase Chain Reaction , Respiratory Tract Infections/virology , Pilot Projects , Incidence , Cross-Sectional Studies , Prospective Studies , Pneumovirus Infections/virology , Paramyxoviridae Infections/virology , Rubulavirus Infections/virology , Coinfection/epidemiology , Coinfection/virology , Genotype
3.
Pesqui. vet. bras ; 39(3): 209-213, Mar. 2019. tab, ilus
Article in English | VETINDEX, LILACS | ID: biblio-1002804

ABSTRACT

The present study investigated the circulation of avian metapneumovirus (aMPV) in wild birds in Brazil. To do so, 131 samples from 366 oropharyngeal or cloacal swabs collected from 18 species of birds were tested individually or in pools by RT-PCR. Samples detected by RT-PCR were selected for DNA sequencing. Thirteen (9.9%) samples were detected by the RT-PCR targeting the N gene and four out of 13 samples were sequenced. Sequencing results showed a high identity with the aMPV subtype A. Our results confirm the circulation of the aMPV subtype A in wild birds in Brazil even five years after its last detection.(AU)


O presente estudo investigou a circulação de metapneumovírus aviário em aves silvestres no Brasil. Para tanto, 131 amostras de 366 suabes orofaringeanos ou cloacais coletados de 18 espécies de aves foram testadas individualmente ou na forma de pools por RT-PCR. As amostras detectadas por RT-PCR foram selecionadas para sequenciamento. Treze (9,9%) das amostras foram detectadas por RT-PCR tendo o gene N como alvo; destas, quatro foram sequenciadas com sucesso. Resultados do sequenciamento mostraram alta identidade com o aMPV de subtipo A. Nossos resultados confirmam a circulação de aMPV subtipo A em aves silvestres no Brasil mesmo cinco anos após sua última detecção.(AU)


Subject(s)
Animals , Psittaciformes/virology , Paramyxoviridae Infections/veterinary , Paramyxoviridae Infections/epidemiology , Strigiformes/virology , Metapneumovirus/isolation & purification , Anseriformes/virology , Columbiformes/virology , Falconiformes/virology , Birds/virology
4.
Rev. Soc. Bras. Med. Trop ; 52: e20180249, 2019. tab
Article in English | LILACS | ID: biblio-1041556

ABSTRACT

Abstract INTRODUCTION: Prevalence of influenza A virus (Flu-A), respiratory syncytial virus (RSV), and human metapneumovirus (hMPV) was assessed in children with acute respiratory infections (ARIs). METHODS: Nasopharyngeal aspirates and throat swabs were subjected to real-time polymerase chain reaction (PCR) to detect RSV and Flu-A and to conventional PCR to detect hMPV. RESULTS: Of the 156 children assessed, 93 (59.6%) carried at least one virus, with 35.9% positive for RSV, 14.1% for hMPV, and 9.6% for Flu-A. The prevalence of co-infections was 2.6%. CONCLUSIONS: The high detection rate may reflect increased sensitivity of real-time PCR compared to traditional PCR and viral culture.


Subject(s)
Humans , Male , Female , Child, Preschool , Child , Adolescent , Respiratory Tract Infections/virology , Respiratory Syncytial Virus Infections/epidemiology , Paramyxoviridae Infections/epidemiology , Influenza, Human/epidemiology , Orthomyxoviridae/genetics , Respiratory Tract Infections/epidemiology , Nasopharynx/virology , Cross-Sectional Studies , Respiratory Syncytial Virus, Human/genetics , Metapneumovirus/genetics , Real-Time Polymerase Chain Reaction , Iran/epidemiology
5.
Buenos Aires; GCBA. Gerencia Operativa de Epidemiología; 13 oct. 2017. a) f: 15 l:17 p. graf.(Boletín Epidemiológico Semanal: Ciudad Autónoma de Buenos Aires, 2, 60).
Monography in Spanish | BINACIS, InstitutionalDB, LILACS | ID: biblio-1103867

ABSTRACT

La parotiditis epidémica (fiebre urliana) es una infección viral cuyo único huésped natural es el ser humano. La enfermedad es en general, benigna y autolimitada y un tercio de las personas afectadas tiene una infección subclínica. Puede producir una infección más grave en individuos que han pasado la pubertad que en los niños. Debido a que el diagnóstico de parotiditis es clínico en un 99%, algunos de los casos podrían corresponder a una etiología diferente a la urliana (enterovirus, Epstein Barr, virus Parainfluenza y Adenovirus). Se estima que el esquema de 2 dosis de vacuna triple viral tiene una efectividad de 88% (rango: 66-95%) en la prevención de enfermedad.Se analizaron casos de parotiditis, confirmados o sospechosos, notificados por el Hospital Piñero de la Ciudad de Buenos Aires y/o CeSAC del Área Programática. La fuente de información utilizada fue el SNVS (Módulo C2). Para los estudios etiológicos, se analizó el registro del laboratorio central del Hospital. (AU) .


Subject(s)
Parotitis/diagnosis , Parotitis/pathology , Parotitis/prevention & control , Parotitis/epidemiology , Paramyxoviridae Infections/epidemiology , Disease Notification , Hospitals, Municipal/statistics & numerical data , Health Surveillance , Catchment Area, Health , Records
6.
Rev. argent. microbiol ; 46(1): 53-57, mar. 2014.
Article in Spanish | LILACS | ID: biblio-1009886

ABSTRACT

Las poblaciones de llamas de Argentina se concentran principalmente en la provincia de Jujuy; su explotación representa un importante recurso económico de las comunidades altoandinas. El objetivo de este trabajo fue evaluar la seroprevalencia de anticuerpos contra algunos agentes virales asociados a enfermedades de impacto productivo en rodeos de llamas de Jujuy. Se analizaron 349 sueros de llamas adultas de 6 departamentos de la puna jujeña ubicados por encima de los 3300 msnm. Se obtuvo una prevalencia del 100 % para rotavirus grupo A y del 70 % para el virus parainfluenza-3 bovino, mientras que no se detectaron reactores para herpesvirus bovino 1, virus de la diarrea viral bovina, influenza A humana (H1N1) e influenza equina (H3N8). Los resultados obtenidos confirman la amplia distribución de rotavirus y virus parainfluenza y la baja susceptibilidad a herpesvirus y pestivirus en las tropas de llamas de la puna jujeña


Llama population from Argentina is mainly concentrated in the Andean Puna, Jujuy. Llamas represent an important economic resource for the Andean communities. The aim of this study was to investigate the prevalence of antibodies against viral antigens associated to viral diseases of economic impact (neonatal diarrhea, reproductive and respiratory syndromes). A total of 349 serum samples from adult llamas were analyzed. The obtained antibody prevalence was 100 % for Rotavirus A and 70 % for Bovine parainfluenza virus 3. In contrast, no reactors were detected to Bovine herpesvirus 1, Bovine viral diarrhea virus 1, Human influenza A virus (H1N1) and Equine influenza virus (H3N8). These results confirm the wide circulation of rotavirus and parainfluenza virus in Argentinean llamas and suggest that susceptibility to infection with bovine herpesvirus, pestivirus and influenza A viruses is low. This serologic survey provides novel information regarding the epidemiology of viral diseases affecting llamas from the Argentinean Andean Puna


Subject(s)
Animals , Argentina/epidemiology , Camelids, New World/immunology , Antibodies/analysis , Rotavirus Infections/epidemiology , Seroepidemiologic Studies , Paramyxoviridae Infections/epidemiology , Rotavirus/isolation & purification , Herpesvirus 1, Bovine/isolation & purification , Parainfluenza Virus 3, Bovine/isolation & purification , Influenza A Virus, H1N1 Subtype/isolation & purification , Influenza A Virus, H3N8 Subtype/isolation & purification
7.
Rev. ANACEM (Impresa) ; 7(2): 70-74, ago. 2013. ilus, tab, graf
Article in Spanish | LILACS | ID: lil-716572

ABSTRACT

INTRODUCCIÓN: En pediatría, las infecciones respiratorias agudas (IRA) constituyen globalmente una importante causa de morbimortalidad. Los principales agentes etiológicos son los virus respiratorio sincicial, parainfluenza (PIV), influenza y adenovirus. Actualmente existen pruebas de diagnóstico molecular que permiten identificar agentes no convencionales. En este estudio se propuso estudiar la presencia de: PIV, coronavirus (COV), rinovirus (RV) y enterovirus humano (EV), utilizando reacción en cadena de polimerasa previa transcriptasa reversa (RCP-TR) en muestras de niños hospitalizados en el Hospital Carlos Van Buren, negativas a inmunofluorescencia (IF) paravirus respiratorios. MATERIALES Y MÉTODOS: Se analizaron un total de 82 muestras de aspirado nasofaríngeo de pacientes menores de 5 años hospitalizados por IRA en el Hospital Carlos Van Buren, negativos a IF, recolectadas entre Diciembre del 2011y Marzo del 2012. Se utilizó una RCP-TR anidada de tipo múltiplex específica para virus PIV (1, 2, 3, 4AB), COV-OC43 y 229E, y genérica para RV y EV. RESULTADOS: Los virus más frecuentes fueron los PIV, siendo identificados en 9 (10 por ciento) muestras, siendo: un 2 por ciento (n=2) PIV-2, un 7 por ciento (n=6) PIV-3 y un 1 por ciento (n=1) PIV-4AB. Además se detectó COV-OC43 en un 2 por ciento (n=2), RV y EV en un 6 por ciento (n=5). No se detectaron co-infecciones con dos o más virus. No hubo asociación entre edad de los niños y tipo de infección viral. DISCUSIÓN: Se describió la presencia de estos virus respiratorios en niños con IRA. Se logró detectar falsos negativos para PIV y se demostró la existencia de COV, RV y EV en la región.


INTRODUCTION: Acute Respiratory infection (ARI) is a major cause of morbidity and mortality worldwide in pediatrics. The main etiological agents are respiratory syncytial virus, parainfluenzavirus (PIV), influenza virus and adenovirus. Currently there are molecular diagnostic tests that have helped to identify unconventional agents. Our aim was to study the presence of: PIV, coronavirus (hCoV), rhinovirus (hRV) and human enterovirus (hEV), by using Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR) in samples of hospitalized children on Carlos Van Buren Hospital negative to immunofluorescence (IF) for respiratory viruses. MATERIALS AND METHODS: A total of 82nasopharyngeal aspirate samples, negative to IF, were collected from children under five years old hospitalized due to ARI at Carlos Van Buren Hospital, between December 2011 and March2012. A Multiplex nested RT-PCR designed for the specifically detection of PIV (1, 2, 3, 4AB), hCoV (OC43 and 229E) and generic detection of RV and EV was used. RESULTS: Parainfluenza was the most frequently identified virus (n=9, 10 percent) specifically PIV-2 (n=2, 2 percent), PIV-3 (n=6, 7 percent) and PIV-4AB (n=1, 1 percent). Followed by hRV and hEV (n=5, 6 percent) and hCoV-OC43 (n=2, 2 percent). There were no co-infections with two or more viruses. There was no correlation between age and type of infection. DISCUSSION: This study described the prevalence of these respiratory viruses in pediatric patients with ARI. It was possible to detect false negative results for parainfluenza virus and also to demonstrate the existence of hCoV, hRV and hEV in the region.


Subject(s)
Humans , Male , Female , Infant , Child, Preschool , Child , Respiratory Tract Infections/epidemiology , Respiratory Tract Infections/virology , Age Distribution , Child, Hospitalized , Chile , Coronavirus Infections/epidemiology , Enterovirus Infections/epidemiology , Paramyxoviridae Infections/epidemiology , Picornaviridae Infections/epidemiology , Reverse Transcriptase Polymerase Chain Reaction , Seasons
8.
Braz. j. infect. dis ; 17(1): 62-68, Jan.-Feb. 2013. ilus, tab
Article in English | LILACS | ID: lil-665776

ABSTRACT

There are scanty data on the epidemiology of influenza and other respiratory viruses in South America and Brazil. The aim of this study was to summarize the data from the Brazilian surveillance system of influenza and other respiratory viruses and discuss the patterns of viral circulation. The system is based on detecting cases of influenza-like illness in sentinel sites and weekly collection of five nasopharyngeal secretions samples, which are processed in state public health laboratories for respiratory viruses by indirect immunofluorescence assay. Data from 2000 to 2010 were described over time, by region, gender, and age group, and an analysis of Spearman correlation was performed between monthly influenza detection and rainfall and temperature data in two state capitals with the highest number of positive samples, one from the northeast region (Maceió) and other from the southern region (Curitiba). There were 3,291,946 visits for influenza-like illness; of these, 37,120 had samples collected and 6421 tested positive: 1690 (26%) influenza A, 567 (9%) influenza B, 277 (4%) parainfluenza 1, 571 (9%) parainfluenza 2, 589 (9%) parainfluenza 3, 742 (12%) adenovirus, and 1985 (31%) respiratory syncytial virus. Overall, increased activity of respiratory syncytial virus was observed from March to June, preceding the peak of influenza activity, from May to August, but with regional differences. In Maceió, there was a weak correlation between temperature and influenza detection (ρ = 0.05), but a moderate positive correlation between rainfall and influenza detection (ρ = 0.36). In Curitiba, a high correlation was observed between the decrease in temperature and rainfall and the increase in influenza detection (ρ = -0.83 and -0.78 respectively). These data are important to guide public health control measures as the best time for influenza vaccination and use of antivirals.


Subject(s)
Adolescent , Adult , Child , Child, Preschool , Female , Humans , Infant , Infant, Newborn , Male , Middle Aged , Young Adult , Adenovirus Infections, Human/epidemiology , Influenza, Human/epidemiology , Paramyxoviridae Infections/epidemiology , Respiratory Syncytial Virus Infections/epidemiology , Adenovirus Infections, Human/virology , Brazil/epidemiology , Fluorescent Antibody Technique, Indirect , Influenza, Human/virology , Nasopharynx/virology , Paramyxoviridae Infections/virology , Real-Time Polymerase Chain Reaction , Respiratory Syncytial Virus Infections/virology , Seasons , Sentinel Surveillance
9.
Lima; s.n; 2013. 91 p. tab, graf.
Thesis in Spanish | LILACS, LIPECS | ID: biblio-1113189

ABSTRACT

Objetivos: Determinar la prevalencia de Virus en Infecciones Respiratorias Bajas en los pacientes internados en el Hospital de Emergencias Pediátricas. Material y métodos: Se realizó un estudio descriptivo, retrospectivo transversal. Se revisaron 274 historias clínicas de pacientes menores de 2 años que ingresaron al Servicio de Hospitalización Pediátrica del Hospital de Emergencias Pediátricas con diagnóstico de Infección Respiratoria Baja y a los que se les realizó algún Tipo de prueba para identificar Virus Respiratorios. Resultados: El 56.6 por ciento de los pacientes fueron del sexo masculino, y el 43.4 por ciento fueron del sexo femenino. Hubo una mayor frecuencia de virus sincicial respiratorio en el 18.6 por ciento de los casos seguido de adenovirus (14.2 por ciento), virus parainfluenza 3 (12 por ciento). El 94.2 por ciento de los casos se detecto con inmunofluorescencia indirecta. El 40.9 por ciento de los pacientes tenían edades entre los 6 a 12 meses. Hubo una mayor frecuencia de internamiento en el mes de Agosto en el 17.2 por ciento de los casos. El diagnóstico de ingreso de mayor frecuencia fue el de síndrome de obstrucción bronquial aguda con un 42 por ciento. El 51.8 por ciento de los casos tuvo una estancia de 4 a 7 días. El hallazgo radiológico de mayor frecuencia fue atrapamiento de aire con un 38.7 por ciento de los casos. El 7.3 por ciento de los pacientes ingresaron a fa UCI. El 41.2 por ciento de los pacientes recibieron tratamiento antibiótico. El 65 por ciento de los pacientes recibieron tratamiento con beta dos agonistas. El 53.6 por ciento recibieron tratamiento con corticoides. El 5.1 por ciento padecían de enfermedad cardiaca. El 4 por ciento tenían el antecedente de prematuridad. El 4.4 por ciento tenían el antecedente de enfermedad pulmonar crónica. La complicación más frecuente fue la atelectasia con un 7.3 por ciento de los casos. Conclusiones: La prevalencia de Virus en Infecciones Respiratorias Bajas en los pacientes...


Subject(s)
Male , Female , Humans , Infant, Newborn , Infant , Child, Hospitalized , Respiratory Tract Infections , Adenoviridae Infections/epidemiology , Paramyxoviridae Infections/epidemiology , Respiratory Syncytial Viruses , Retrospective Studies , Cross-Sectional Studies
10.
Biomédica (Bogotá) ; 32(2): 174-178, abr.-jun. 2012. tab
Article in Spanish | LILACS | ID: lil-656824

ABSTRACT

El metaneumovirus humano es un nuevo patógeno asociado a infecciones respiratorias, principalmente en niños, que produce cuadros clínicos que van desde leves hasta graves, los cuales pueden incluso requerir tratamiento en unidades de cuidados intensivos. Hasta el momento, la reacción en cadena de la polimerasa con transcripción inversa y el cultivo celular son los métodos más usados para su diagnóstico. Se presentan los seis primeros casos de metapneumovirus humano en niños de Medellín, Colombia.


Human metapneumovirus is a newly discovered pathogen associated with respiratory disease and occurring mainly in children. It produces an acute viral respiratory disease picture that varies from mild disease to severe, and which can require strict surveillance in intensive care units. Currently, reverse transcriptase polymerase chain reaction and cell culture are the most common methods for its diagnosis. The first six cases of human metapneumovirus in Colombia are presented from Medellín.


Subject(s)
Child , Child, Preschool , Female , Humans , Infant , Male , Metapneumovirus/isolation & purification , Paramyxoviridae Infections/virology , Pneumonia, Viral/virology , /therapeutic use , Hypoxia/etiology , Anti-Bacterial Agents/therapeutic use , Clarithromycin/therapeutic use , Colombia/epidemiology , Fever/etiology , Immunologic Tests , Paramyxoviridae Infections/complications , Paramyxoviridae Infections/diagnosis , Paramyxoviridae Infections/epidemiology , Paramyxoviridae Infections , Pneumonia, Mycoplasma/complications , Pneumonia, Mycoplasma/drug therapy , Pneumonia, Viral/complications , Pneumonia, Viral/epidemiology , Pneumonia, Viral , Reverse Transcriptase Polymerase Chain Reaction , Superinfection , Virus Cultivation
11.
Salud pública Méx ; 52(6): 528-532, Nov.-Dec. 2010. graf, tab
Article in Spanish | LILACS | ID: lil-572714

ABSTRACT

OBJETIVO. Describir la frecuencia de virus respiratorios y características clínicas en niños con cuadros respiratorios de un hospital de tercer nivel en México. MATERIAL Y MÉTODOS. Se incluyeron niños con diagnóstico de infección respiratoria y un resultado positivo por inmunofluorescencia de enero 2004 a octubre 2006. RESULTADOS. De 986 muestras nasofaríngeas, 138 (14 por ciento) fueron positivas. La frecuencia fue: 80 por ciento virus sincicial respiratorio (VSR), 8 por ciento parainfluenza 1, 5 por ciento parainfluenza3, 2 por ciento adenovirus, 2 por ciento influenza A, 1 por ciento parainfluenza 2 y 1 por ciento influenza B. CONCLUSIONES. La frecuencia de virus respiratorios fue de 14 por ciento. El VSR se identificó asociado con más frecuencia, a neumonía y bronquiolitis en menores de 3 años.


OBJECTIVE. To describe the frequency of respiratory viruses and clinical characteristics in children with respiratory signs and symptoms in a tertiary care center in Mexico. MATERIAL AND METHODS. Patients with a clinical diagnosis of respiratory infection and a positive immunofluorescence result (Light Diagnostics) from January 2004 to October 2006 were included. RESULTS. From the 986 nashopharyngeal samples, 138 (14 percent) were positive by immunofluorescence. The frequency was: 80 percent RSV, 8 percent parainfluenza 1, 5 percent parainfluenza 3, 2 percent adenovirus, 2 percent influenza A, 1 percent parainfluenza 2 and 1 percent influenza B. CONCLUSIONS. Respiratory viruses were detected in 14 percent of samples tested. RSV was the most frequently identified virus and was associated with pneumonia and bronchiolitis in children younger than 3 years old.


Subject(s)
Adolescent , Child , Child, Preschool , Female , Humans , Infant , Infant, Newborn , Male , Hospitals, University/statistics & numerical data , Respiratory Tract Infections/epidemiology , Virus Diseases/epidemiology , Adenoviridae Infections/epidemiology , Bronchiolitis/epidemiology , Bronchiolitis/virology , Cross-Sectional Studies , Fluorescent Antibody Technique, Indirect , Influenza, Human/epidemiology , Mexico/epidemiology , Nasopharynx/virology , Paramyxoviridae Infections/epidemiology , Pneumonia, Viral/epidemiology , Pneumonia, Viral/virology , Respiratory Syncytial Virus Infections/epidemiology , Respiratory Tract Infections/virology , Retrospective Studies , Urban Population/statistics & numerical data
12.
Arch. pediatr. Urug ; 81(4)2010. tab
Article in Spanish | LILACS | ID: lil-609752

ABSTRACT

Introducción: las infecciones respiratorias agudas bajas (IRAB) son la primer causa de hospitalización a lo largo del año. La etiología viral es la más frecuente. El Metapneumovirus humano (MNVh) ha sido vinculado a las IRAB con aspirado negativo para Virus respiratorio sincicial (VRS) y Adenovirus (AD). Objetivo: determinar la prevalencia, epidemiología, clínica y severidad de las infecciones por MNVh, e intentar detectar un patrón radiológico relacionado con el mismo. Métodos: se estudiaron niños entre 0 y 2 años de edad internados por IRAB en el Centro Hospitalario Pereira Rossell, Hospital Central de las Fuerzas Armadas, Hospital Policial, Hospital Británico y Asociación Española Primera de Socorros Mutuos en el período 1 de abril al 30 de noviembre de 2006. Los aspirados nasofaríngeos fueron analizados en la Sección Virología de la Facultad de Ciencias. Resultados: se estudiaron 185 pacientes, obteniéndose 17 resultados positivos para MNVh (9,2%), con 9 coinfecciones con VRS. La mayoría de los pacientes tenían 6 meses o menos de edad. Las manifestaciones clínicas principales fueron polipnea, tirajes y sibilancias. Los principales hallazgos radiológicos fueron infiltrado intersticial difuso e hiperinsuflación. Ningún paciente requirió internación en unidad de cuidados intensivos y no hubo casos fatales. Conclusiones: la prevalencia, características clínicas y evolutivas de las infecciones por MNVh no mostraron diferencias frente a las producidas por el VRS.


Subject(s)
Humans , Paramyxoviridae Infections/epidemiology , Metapneumovirus , Child, Hospitalized , Prevalence
13.
Journal of Korean Medical Science ; : 342-347, 2010.
Article in English | WPRIM | ID: wpr-169076

ABSTRACT

Human metapneumovirus (HMPV) shares clinical and epidemiological characteristics with well-known respiratory syncytial virus (RSV). The aim of this study was to investigate the clinical and epidemiological differences between HMPV- and RSV-induced wheezing illnesses. A total of 1,008 nasopharyngeal aspirate specimens was collected from 1,008 pediatric patients hospitalized with acute respiratory tract infection at Inje University Sanggye Paik Hospital from December 2003 to April 2008, and tested for seven common respiratory viruses. Conditions classified as wheezing illness were bronchiolitis, reactive airways disease, and bronchial asthma. HMPV caused a significantly lower proportion of wheezing illness when compared to RSV (48.1% vs. 82.2%, P<0.05). HMPV-induced wheezing illness occurred predominantly in older patients when compared to RSV patients (P<0.001). RSV infections peaked in the fall and winter followed by peaks of HMPV infection in winter and spring. Eosinophil counts were significantly higher (P<0.01) in RSV patients when compared to HMPV patients. These results show that human metapneumovirus patients exhibit several different clinical and epidemiological characteristics, such as higher proportion of wheezing illness, age and seasonal incidence, and eosinophil counts, when compared to RSV patients.


Subject(s)
Child , Child, Preschool , Female , Humans , Infant , Male , Bronchiolitis/physiopathology , Korea/epidemiology , Metapneumovirus/pathogenicity , Nasopharynx/virology , Paramyxoviridae Infections/epidemiology , Respiratory Sounds/physiopathology , Respiratory Syncytial Virus Infections/epidemiology , Respiratory Syncytial Viruses/pathogenicity , Retrospective Studies , Seasons
14.
Rev. chil. enferm. respir ; 25(4): 211-217, 2009. tab, graf
Article in Spanish | LILACS | ID: lil-556740

ABSTRACT

Human metapneumovirus (hMPV) is a newly recognized virus associated with upper and lower respiratory tract infection (LRTI). A prospective - 2 - years study aimed to evaluate the circulation rate and the clinical features associated with hMPV infection was conducted in children hospitalized by a severe LRTI. Results: hMPV was found in 24 (10.5 percent) out of the 229 children enrolled. 42 percent> hMPV patients were under 12 months-old and 58 percent have at least one risk factor for severe course of the illness. The most common diagnosis was pneumonia (62.5 percent). Fourty two percent of the patients required assisted ventilation for severe respiratory failure. Co-infections with other respiratory viruses did not result in greater severity of illness. In conclusion our study supports the significant role of hMPV as a major pathogen in severe LRTI in children.


El metapneumovirus humano (hMPV) es un virus de reciente diagnóstico. Se asocia con infecciones respiratorias agudas altas y bajas (IRAb). Se efectuó un estudio prospectivo durante dos años con el objetivo de evaluar la tasa de circulación y los hallazgos clínicos asociados a la infección por hMPV en niños hospitalizados por una IRAb grave. Resultados: hMPV fue demostrado en 24 (10,5 por ciento) de los 229 niños enrolados. 42 por ciento de los pacientes con hMPV eran menores de 12 meses de edad y el 58 por ciento tenía al menos un factor de riesgo para evolución grave de la enfermedad. El diagnóstico más frecuente fue neumonía (62,5 por ciento). Un 42 por ciento de los pacientes requirieron ventilación mecánica asistida por falla respiratoria severa. La co-infección con otros virus respiratorios no significó una enfermedad más grave. En conclusión nuestro estudio confirma la importancia del hMPV como un agente importante en la IRAb grave en niños.


Subject(s)
Humans , Male , Adolescent , Female , Infant, Newborn , Infant , Child, Preschool , Child , Paramyxoviridae Infections/epidemiology , Respiratory Tract Infections/epidemiology , Acute Disease , Chile/epidemiology , Hospitalization , Paramyxoviridae Infections/therapy , Respiratory Syncytial Virus Infections/epidemiology , Respiratory Tract Infections/therapy , Respiratory Tract Infections/virology , Metapneumovirus/isolation & purification , Prospective Studies , Respiration, Artificial , Seasons , Respiratory Syncytial Virus, Human/isolation & purification
15.
Indian J Med Microbiol ; 2008 Apr-Jun; 26(2): 123-6
Article in English | IMSEAR | ID: sea-54056

ABSTRACT

PURPOSE: The newly described human metapneumovirus (hMPV) has been recently discovered as an etiological agent of acute respiratory infections (ARTI) in infants and children. The aim of this study was to determine the prevalence of hMPV and its potential role as causative agent of ARTI in Ahwaz children. METHODS: In the present study, we examined 124 nasal swabs from infants affected by ARTI for the presence of hMPV by RT-PCR technique. RESULTS: Sixty-eight out of 124 (54.4%) cases were positive for hMPV which is the highest incidence of hMPV ever reported in the world, 94.1% of positive cases belonged to genotype A; whereas no B genotype was detected. Our positive hMPV children were affected by upper (URTI) as well as lower respiratory tract infection (LRTI); however, LARTIs had higher prevalence. CONCLUSIONS: We suggest a probable role of F protein alteration as the causative agent for the highest prevalence of hMPV infection among Ahvaz children.


Subject(s)
Female , Genotype , Humans , Infant , Infant, Newborn , Iran/epidemiology , Male , Metapneumovirus/classification , Paramyxoviridae Infections/epidemiology , Prevalence , RNA, Viral/genetics , Respiratory Tract Infections/epidemiology , Reverse Transcriptase Polymerase Chain Reaction/methods
16.
Journal of Kerman University of Medical Sciences. 2008; 15 (4): 305-311
in English, Persian | IMEMR | ID: emr-87952

ABSTRACT

Acute respiratory infections are common cause of mortality during childhood. This study was designed to determine the incidence of adenovirus, parainfluenza virus and respiratory syncytial virus in respiratory infections by Multiplex PCR method. This study included 168 children under 2 years of age with clinical diagnosis of bronchiolitis. Nasopharyngeal specimens were taken and transferred to the virology laboratory in VTM transport medium. Following extraction of viral DNA and RNA, Multiplex RT-PCR was performed. From 168 specimens, 33 cases [19.6%] were infected with parainfluenza viruses, 18 cases [10.7%] with adenovirus and 63 cases [37.5%] with RSV. The rest of the specimens were negative for these viruses, which indicated that these specimens had been probably infected with other viral agents not investigated in this study, or with mycoplasma. No significant correlation was found between WBC count, ESR values, degree of air trapping, coryza, fever, cough, retraction rale, wheezing and the type of viral infection. Also no significant correlation was found based on age, sex or general condition of patients. Major causes of viral infections in this study were respectively respiratory syncytial virus [RSV], parainfluenza and adenovirus


Subject(s)
Humans , Respiratory Tract Infections/mortality , Paramyxoviridae Infections/epidemiology , Adenoviridae Infections/epidemiology , Respiratory Syncytial Virus Infections/epidemiology , Child , Bronchiolitis , Polymerase Chain Reaction , DNA , RNA
17.
Rev. salud pública ; 9(4): 576-586, oct.-dic. 2007. tab, graf
Article in Spanish | LILACS | ID: lil-472261

ABSTRACT

Objetivo: Se llevo a cabo un estudio en niños que consultaban por infección respiratoria aguda al Hospital Militar (Hosmil) de Bogota, Colombia, con el objetivo de estimar la frecuencia de enfermedad respiratoria aguda en esa institución producida por algunos virus respiratorios. Métodos: Durante 18 meses, de Marzo de 2000 a Septiembre de 2001, se seleccionaron semanalmente tres a cinco niños con infección respiratoria de aquellos que consultaban al servicio de emergencia o de consulta ambulatoria del Hospital. De cada uno de ellos se obtuvo muestras nasofaringeas que fueron examinadas por inmunofluorescencia para virus sincitial respiratorio (VSR), influenza, adenovirus y parainfluenza. Resultados: Se estudiaron 139 niños de los cuales el 40 por ciento fue positivo para alguno de los virus estudiados. El agente viral mas frecuentemente encontrado fue el VSR (27 por ciento), seguido por el virus de la influenza (5 por ciento) y adenovirus (3 por ciento). La circulación de VSR coincidía con los picos de hospitalizaciones por IRA y por neumonía y del hospital, era mas frecuente en los niños menores de 3 años y se encontraba presente durante todo el año. Conclusiones: Los virus respiratorios causan gran parte de la enfermedad respiratoria moderada o severa en el Hosmil y el VSR es el agente más importante entre ellos.


Objective: A study was carried out on children seeking medical care at the Hospital Militar (Hosmil) in Bogota due to acute respiratory infection; it was aimed at estimating the frequency of respiratory virus-associated acute respiratory disease (ARD) in children aged under 10. Methods: Three to five children aged less than 10 years old were selected every week from the hospital's emergency ward or ambulatory services over an 18-month period from March 2000 to September 2001. Nasopharyngeal samples were obtained from them and processed using indirect immunofluorescence. The relative frequency of respiratory syncytial virus (RSV), influenza, adenovirus and parainfluenza were calculated. Results: Around 40 percent of the 139 children examined proved positive for at least one respiratory virus. RSV was the most frequently found virus (27 percent positivity: 38 patients) followed by influenza (5 percent: 7 patients) and adenovirus (3 percent: 4 patients). RSV circulation peaks coincided with peaks related to ARD and pneumonia in the hospital: it was found most frequently in children aged less than 3 and was present throughout the year. Conclusion: Respiratory viruses were an important cause of moderate to severe respiratory illness in children seeking health care at Hosmil; RSV was the leading agent amongst such viruses.


Subject(s)
Child, Preschool , Female , Humans , Male , Respiratory Tract Infections/epidemiology , Respiratory Tract Infections/virology , Acute Disease , Adenoviridae Infections/epidemiology , Adenoviridae Infections/virology , Adenoviridae/isolation & purification , Catchment Area, Health , Colombia/epidemiology , Hospitals, Military/statistics & numerical data , Paramyxoviridae Infections/epidemiology , Paramyxoviridae Infections/virology , Referral and Consultation , Respiratory Syncytial Viruses/isolation & purification
18.
Rev. chil. infectol ; 24(1): 19-26, feb. 2007. ilus, tab, graf
Article in Spanish | LILACS | ID: lil-443053

ABSTRACT

Metapneumovirus humano (MPVh) fue detectado entre julio y noviembre en 15 de 123 niños bajo 3 años de edad hospitalizados por infección respiratoria aguda (12 por ciento). Las muestras fueron estudiadas mediante técnicas de biología molecular (RPC-TR de muestra de hisopado nasofaríngeo y/o de sobrenadante de cultivo). El 67 por ciento de los niños hospitalizados con MPVh tenían menos de 1 año de edad, todos ellos presentaron tos y fiebre y el principal motivo de hospitalización fue el requerimiento de oxígeno en 73 por ciento de los casos. Si bien un tercio de los pacientes tenía patología previa, su evolución clínica no fue diferente respecto de los niños previamente sanos. El patrón radiológico mostró aumento de la trama intersticial, con focos de consolidación en 6 casos (40 por ciento). El diagnóstico más frecuente fue síndrome bronquial obstructivo o bronquiolitis, asociado o no a neumonía. Destaca la necesidad de un método de diagnóstico rápido para optimizar el diagnóstico diferencial, manejo y control de infecciones en estos pacientes.


Human metapneumovirus was detected in 15 of 123 children (12 percent) younger than 3 years of age hospitalized for treatment of acute respiratory infection between July and November 2004. The virus was detected by RT-PCR directly from nasopharyngeal swabs and/or from supernatants after cell culture. Children infected with hMPV were mostly younger than one year of age (67 percent), all presenting with fever and cough. The main cause for hospitalization was the need for oxygen therapy (73 percent). Four hMPV positive children had an identifiable co-morbid condition but had a similar clinical evolution when compared to previously healthy infants. Chest radiography showed an increase in interstitial infiltrates with focal consolidation in 6 children. Obstructive bronchial syndrome and bronchiolitis, with or without pneumonia, were the most frequent diagnosis associated with hMPV positivity. A rapid and sensitive diagnostic method is required to improve diagnosis and treatment of these patients.


Subject(s)
Humans , Male , Female , Infant, Newborn , Infant , Child, Preschool , Metapneumovirus/isolation & purification , Paramyxoviridae Infections/epidemiology , Respiratory Tract Infections/epidemiology , Acute Disease , Chile/epidemiology , Hospitalization , Metapneumovirus/genetics , Prospective Studies , Paramyxoviridae Infections/diagnosis , Paramyxoviridae Infections/virology , Reverse Transcriptase Polymerase Chain Reaction , Respiratory Tract Infections/diagnosis , Respiratory Tract Infections/virology
19.
Rev. chil. infectol ; 23(2): 111-117, jun. 2006. tab, graf
Article in Spanish | LILACS | ID: lil-427828

ABSTRACT

El comportamiento epidemiológico del virus influenza (FLU) en la comunidad se refleja en el hospital, es planteable que la actividad comunitaria de otros virus respiratorios también se traduzca en un alza de las internaciones por estos agentes. Objetivo: describir la presencia y características clínico-epidemiológicas de infecciones por virus respiratorios no-FLU (virus respiratorio sincicial-VRS, parainfluenza y adenovirus-ADV) entre adultos hospitalizados durante la temporada de influenza y establecer una comparación con virus influenza-A (IA) o -B (IB). Pacientes y Método: Adultos internados en Hospital Clínico Universidad Católica, de mayo a julio de 2004, con infección por IA o IB, y VRS, parainfluenza (1-2-3) o ADV demostrada por test rápido o inmunofluorescencia directa. Resultados: Se identificaron 86 casos: 73,5 por ciento FLU (48,2 por ciento, IA y 25,3 por ciento IB) y 26,5 por ciento no-FLU. (15,7 por ciento parainfluenza-2; 8,4 por ciento VRS, 1,2 por ciento parainfluenza-3 y 1,2 por ciento ADV). El grupo con FLU presentó más frecuentemente mialgias, tos, hospitalización por síndrome febril, mayores valores de PCR y porcentaje de baciliformes (p < 0,05). Conclusiones: Durante la temporada de influenza 2004, 26,5 por ciento de las infecciones entre adultos hospitalizados fueron causadas por virus no-FLU. La dificultad en diferenciar infecciones por virus FLU de no-FLU, plantea la necesidad de ampliar el estudio de la etiología viral incluso durante la temporada de FLU.


Subject(s)
Adolescent , Adult , Humans , Middle Aged , Respiratory Tract Infections/complications , Respiratory Tract Infections/epidemiology , Respiratory Tract Infections/virology , Clinical Evolution , Chile/epidemiology , Influenza, Human/epidemiology , Hospitalization , Adenoviridae Infections/epidemiology , Paramyxoviridae Infections/epidemiology , Respiratory Syncytial Virus Infections/epidemiology , Retrospective Studies
20.
Journal of Korean Medical Science ; : 838-842, 2006.
Article in English | WPRIM | ID: wpr-14639

ABSTRACT

Human metapneumovirus (hMPV) is a recently isolated virus, mostly associated with acute lower respiratory infection in children, of which symptoms are similar to those of respiratory syncytial virus (RSV) infection. The aim of our study was to determine the frequency of hMPV in hospitalized children with acute respiratory tract disease in Korea. Nasal aspirates from hospitalized children with respiratory infections under 15 yr old between December 2003 and February 2005 were included in the study. Each sample was analyzed for RSV, adenovirus, influenza virus A and B, and parainfluenza virus by indirect fluorescent assay (IFA). F-gene sequences were used for PCR for the detection and sequencing of hMPV. In total 381 samples, negative samples in which any viral pathogen could not be identified by IFA were 231 cases. hMPV was detected using reverse transcriptase-PCR (RT-PCR) in 28 of 231 (12.1%) children who were not infected with another respiratory viruses. The hMPV-infected children were diagnosed as having pneumonia, bronchiolitis, bronchial asthma exacerbation, croup, and upper respiratory tract infection. Most of the RT-PCR positive samples for hMPV were collected in winter season. These results suggest that hMPV may be a responsible pathogen causing acute respiratory tract infection in Korean children.


Subject(s)
Male , Infant , Humans , Female , Child, Preschool , Child , Reverse Transcriptase Polymerase Chain Reaction , Respiratory Tract Infections/etiology , Phylogeny , Paramyxoviridae Infections/epidemiology , Metapneumovirus/classification , Hospitalization , Acute Disease
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