Enfermedad de Still del adulto: serie de casos / Adult Still's disease: case series

Resumen La enfermedad de Still del adulto (ESA) es una enfermedad reumática e inflamatoria, infrecuente, de etiología desconocida. Su presentación clínica es variada y sus síntomas más frecuentes son fiebre, artralgias, exantema asalmonado evanescente, odinofagia, adenopatías, hepatoesplenomegalia, serositis y presencia en laboratorio de leucocitosis (neutrofilia), hiperferritinemia asociado a ausencia de anticuerpos. El diagnóstico es clínico y por exclusión. Existen criterios clasificatorios como son los de Yamaguchi1, Cush y Fautrel2,3 que ayudan a la orientación diagnóstica. El tratamiento se define según la presentación y la evolución clínica1. Se describen las características clínicas, diagnósticas, tratamiento y evolución de siete pacientes con ESA.

Abstract Adult Still's disease (ASD) is an uncommon rheumatic and inflammatory disorder of unknown etiology. The major clinical features include fever, arthralgia, transient salmon-pink rash, odynophagia, lymphadenopathy, hepatosplenomegaly, serositis, and laboratory findings such as leukocytosis with neutrophilia, hyperferritinemia, and negative immunologic laboratory testing. ASD diagnosis is reached by exclusion. Different classification criteria such as Yamaguchi, Cush and Fautrel have been developed for the identification of ASD. Treatment is based on the degree of disease activity and clinical response1. We describe clinical manifestations, diagnosis, treatment, and prognosis of seven patients with adult's Still disease.

Hidatidosis subcutánea primaria

La hidatidosis o equinococosis quística es una zoonosis parasitaria endémica causada por el estadio larvario del cestode Echinococcus granulosus. El hígado y el pulmón son los órganos con afección más frecuente. Su ubicación subcutánea es una entidad rara, poco descrita, y por ende un reto diagnóstico. Describimos el caso de una mujer, de 18 años de edad, procedente de un área endémica, que presentó un quiste hidatídico primario supraclavicular.

Hydatid disease or cystic echinococcosis is an endemic parasitic zoonosis caused by the larval stage of the cestode Echinococcus granulosus, the liver and lung being the most frequently affected organs. Its subcutaneous location is a rare entity, little described, and therefore a diagnostic challenge. We describe the case of an 18-year-old woman from an endemic area who presented with a primary supraclavicular hydatid cyst.

Sialoadenitis esclerosante asociada a enfermedad por IgG4: reporte de un caso / Sclerosing sialadenitis associated with IgG4 disease: case report

Las enfermedades relacionadas con IgG4 (ER-IgG4) son entidades fibroinflamatorias e inmunomediadas, caracterizadas por la afección multiorgánica, con la formación de pseudotumores que provocan lesión tisular y daño orgánico subsecuente. Se describe el caso de un paciente de 43 años que presentó sialoadenitis esclerosante y cumplió todos los criterios diagnósticos de enfermedad relacionada con IgG4.

IgG4-related diseases (IgG4-RD) are fibroinflammatory immune-mediated entities characterized by multiorgan involvement with the development of pseudotumors that cause tissue injury and subsequent organ damage. We describe the case of a 43-year-old man who presented sclerosing sialadenitis and fulfilled the diagnostic criteria for IgG4-related disease.

Síndrome antisintetasa: reporte de un caso / Antisynthetase syndrome: a case repor

El síndrome antisintetasa es una miopatía inflamatoria idiopática (MII) de origen autoinmune, poco frecuente, que se caracteriza por la presencia de autoanticuerpos antisintetasa ARNt (generalmente anti-Jo1), asociado frecuentemente a miositis, enfermedad pulmonar intersticial, poliartritis, manos de mecánico y fenómeno de Raynaud. Se reporta el caso de una mujer de 45 años de edad que presenta este síndrome con características fenotípicas de dermatomiositis y responde de forma favorable luego de la administración del tratamiento con glucocorticoides asociado a metotrexato.

Anti-synthetase syndrome is a rare autoimmune inflammatory myopathy characterized by autoantibodies against tRNA synthetases (most commonly anti-Jo1) with clinical features that include myositis, interstitial lung disease, polyarthritis, mechanic's hands and Raynaud's phenomenon. We report a 45-year-old woman who presented with dermatomyositis phenotypical features and a significant improvement with corticosteroids and metotrexate treatment.

Síndrome antisintetasa: reporte de un caso / Antisynthetase syndrome: a case report

El síndrome antisintetasa es una miopatía inflamatoria idiopática (MII) de origen autoinmune, poco frecuente, que se caracteriza por la presencia de autoanticuerpos antisintetasa ARNt (generalmente anti-Jo1), asociado frecuentemente a miositis, enfermedad pulmonar intersticial, poliartritis, manos de mecánico y fenómeno de Raynaud. Se reporta el caso de una mujer de 45 años de edad que presenta este síndrome con características fenotípicas de dermatomiositis y responde de forma favorable luego de la administración del tratamiento con glucocorticoides asociado a metotrexato.

Anti-synthetase syndrome is a rare autoimmune inflammatory myopathy characterized by autoantibodies against tRNA synthetases (most commonly anti-Jo1) with clinical features that include myositis, interstitial lung disease, polyarthritis, mechanic's hands and Raynaud's phenomenon. We report a 45-year-old woman who presented with dermatomyositis phenotypical features and a significant improvement with corticosteroids and metotrexate treatment.

Factores asociados con el consumo excesivo de alcohol: Encuesta Nacional de Salud y Nutrición 2020 sobre Covid-19 / Factors associated with binge drinking: National Health and Nutrition Survey 2020, Covid-19

Resumen: Objetivo: Conocer la magnitud del consumo excesivo de alcohol (CEA) y su asociación con los factores individuales, familiares y sociales entre agosto y noviembre de 2020 en México. Material y métodos: Con base en los datos de la Encuesta Nacional de Salud y Nutrición 2020 sobre Covid-19, se analizaron 8 595 adultos mayores de 20 años. Se estimaron modelos de regresión logística estratificados por sexo y se obtuvieron razones de momios (RM) con intervalos de confianza al 95% (IC95%). Resultados: El CEA fue de 40.43%; hombres 56.49% y mujeres 25.70%. Los principales factores asociados fueron ser hombre (RM=3.66; IC95%: 3.22,4.12), edad de 20 a 29 años (RM=3.65; IC95%: 2.89,4.63), salir a trabajar durante la pandemia (RM=1.56; IC95%: 1.33,1.81) y tener dos o más escolares en el hogar (RM=1.20; IC95%: 1.03,1.39). Conclusiones: En México, el patrón de CEA es prevalente; por su naturaleza de riesgo y su amplia distribución poblacional, es prioritario implementar intervenciones preventivas individuales y de salud pública.

Abstract: Objective: Estimate the magnitude of binge drinking and its association with individual, family, and social factors between August to November 2020 in Mexico. Materials and methods: Based on the data from National Health and Nutrition Survey 2020 Covid-19, 8 595 adults over 20 years old were analyzed. Stratified logistic regression models by sex were estimated obtaining odds ratio (OR) with 95% confidence intervals (95%CI). Results: The binge drinking reported was 40.43%; in men 56.49% and in women 25.70%. The main associated factors were being a man (OR=3.66; 95%CI: 3.22,4.17), age 20 to 29 years (OR=3.56; 95%CI: 2.89,4.63), going to work during the pandemic (OR=1.56; 95%CI: 1.33,1.81), and having two or more people of school children (OR=1.20; 95%CI: 1.03,1.39). Conclusions: The binge drinking pattern in Mexico is prevalent; due to the risky nature and the wide population distribution, it is a priority to implement individual preventive and public health interventions.

Encodat 2016: violencia de pareja y uso de tabaco, alcohol y drogas. Nuevos retos para la salud mental / Encodat 2016: Intimate partner violence and the use of tobacco, alcohol and drugs. New challenges for mental health

Resumen: Objetivo: Estimar la prevalencia de violencia de pareja por sexo y su asociación con el uso de tabaco, alcohol y drogas en México. Material y métodos: Estudio transversal de la Encuesta Nacional de Consumo de Drogas, Alcohol y Tabaco 2016, que incluyó a 34 861 personas de 12 a 65 años. Se estimaron modelos de regresión logística para obtener razones de momios (RM) e intervalos de confianza al 95% (IC95%). Resultados: La prevalencia de violencia de pareja fue de 15.14%; 18.16% en mujeres y 11.89% en hombres. Factores asociados: consumo excesivo de alcohol (RM: 1.64; IC95% 1.38-1.96), consumo de tabaco (RM:1.71;IC95% 1.42-2.07), consumo de medicamentos psicotrópicos sin receta (RM: 3.72; IC95% 1.76-7.88) y consumo de marihuana (RM: 3.06; IC95%: 1.58-5.91). Conclusiones: Los resultados apoyan la necesidad de implementar intervenciones multisectoriales, fortalecer competencias psicosociales para lograr la mejora de la calidad y acceso a los servicios de salud mental y adicciones en México.

Abstract: Objective: Estimate the prevalence of intimate partner violence by sex and the association with tobacco, alcohol, and drugs use in Mexico. Materials and methods: A cross-sectional study of the 2016 National Survey on Drug, Alcohol, and Tobacco Consumption included 34 861 people aged 12 to 65 years old. Logistic regression models were estimated obtaining odds ratios (OR) and 95% confidence intervals (95%CI). Results: The prevalence of intimate partner violence was 15.14%, 18.16% in women, and 11.89% in men. The factors associated were: binge drinking (OR:1.64; 95%CI 1.38-1.96), tobacco consumption (OR: 1.71; 95%CI 1.42-2.07), use of psychotropic drugs without a prescription (OR:3.72; 95%CI 1.76-7.88) and marijuana use (OR: 3.06; 95%CI 1.58-5.91). Conclusions: The findings support the need to implement multisectoral interventions and strengthen psychosocial competencies to improve the quality and access to mental health and addiction services in Mexico.

Evaluación del impacto de la cuarentena por la pandemia de COVID-19 en la transmisión perinatal del VIH en Buenos Aires, Argentina / Assessment of the impact of the COVID-19 pandemic lockdown on perinatal HIV transmission in Buenos Aires, Argentina

Objetivos: Describir variables epidemiológicas clave durante el año 2020 (pandemia de COVID-19) con respecto a la prevención de la transmisión perinatal (TP) del VIH en Ciudad de Buenos Aires (CABA), comparando con períodos previos.Métodos: Análisis retrospectivo de los datos agregados de TP de las principales maternidades de CABA. El año pandémico (2020) se comparó con los años no pandémicos 2018 y 2019.Resultados: Se observó una reducción del total de nacimientos en 2020 en comparación con 2019 y 2018 (11.640 vs. 14.031 y 15,978, respectivamente). La proporción de nacidos vivos en madres VIH+ (MEV) fue 0,88% en 2020, sin diferencia con 2019 y 2018 (0,94% y 0,93%), p> 0,05 para todas las comparaciones. Entre las MEV, el diagnóstico intraparto fue del 2,9% para 2020, sin diferencias con 2019 (2,25%) y 2018 (9,3%), p> 0,05 (todas las comparaciones); el 8,8% comenzó el tratamiento antirretroviral con > 28 semanas de edad gestacional en 2020 frente al 16% y el 18,05% en 2018 y 2019 (p> 0,05, todas las comparaciones). La prevalencia de la carga viral indetectable en el momento del parto fue del 67% en 2020 frente al 64% en 2018 y del 65,4% en 2019 (p> 0,05, todas las comparaciones). La transmisión perinatal fue 0% en 2020 vs. 1,33% en 2018 y 2,25% 2019 (p> 0,05, todas las comparaciones).Conclusiones: En la primera ola de la pandemia de COVID-19 no se observaron cambios en la proporción de MEV asistidas, diagnóstico intraparto de VIH, inicio tardío del TARV y TP en CABA

Background: To describe key epidemiological variables in 2020 (COVID-19 pandemic) regarding prevention of mother-to-child transmission (MTCT) in Buenos Aires city (CABA) in comparison with previous periods. Methods: Retrospective analysis of aggregated MTCT data was gathered from six principal maternity hospitals in Buenos Aires city. Pandemic year (2020) was compared to non-pandemic years 2018-19 individually considering key epidemiological variables. Results: A reduction of total births was observed in 2020 compared to 2019 and 2018 (11640 vs. 14031 and 15978, respectively). Proportion of live births in HIV-infected women (HPW) was 0.88% in 2020 without difference with 2019 and 2018 (0.94% and 0.93%), p> 0.05 for all comparisons. Among HPW, intrapartum diagnosis was 2.9% for 2020, with no difference between 2019 (2.25%) and 2018 (9.3%), p>0.05 (all comparisons); 8.8% had antiretroviral therapy (ART) started > 28 weeks of gestational age in 2020 vs. 16% and 18.05% in 2018 and 2019 (p> 0.05, all comparisons). Prevalence of undetectable viral load at delivery was 67% in 2020 vs 64% in 2018 and 65.4% in 2019 (p> 0.05, all comparisons). Perinatal transmission was 0% in 2020 vs 1.33% in 2018 and 2.25% 2019 (p> 0.05, all comparisons) Conclusions: In first wave of COVID 19 pandemic no changes in the proportion of HPW assisted, HIV intrapartum diagnosis, late ART initiation and MTCT-rate was observed in CABA

Prevalencia y factores psicológicos asociados con conducta suicida en adolescentes. Ensanut 2018-19 / Prevalence and psychological factors associated with suicidal behavior in adolescents. Ensanut 2018-19

Resumen: Objetivo: Estimar la prevalencia de conducta suicida y su asociación con factores psicológicos en adolescentes mexicanos. Material y métodos: Estudio transversal proveniente de la Encuesta Nacional de Salud y Nutrición (Ensanut 2018-19). Se estimaron modelos de regresión logística, con lo que se obtuvieron razones de momios (RM) con intervalos de confianza al 95% (IC95%). Resultados: La prevalencia nacional de ideación e intento de suicidio fue de 5.1 y 3.9%, respectivamente; fue más alta en Guanajuato (ideación: 9.0%, intento: 7.8%). Factores asociados. Ideación suicida: tabaco (RM= 2.26; IC95%: 1.62-3.16), alcohol (RM= 2.12; IC95%: 1.65-2.73), sintomatología depresiva (RM= 6.04; IC95%: 4.71-7.73), abuso sexual (RM= 6.57; IC95%: 4.57-9.45). Intento de suicidio: tabaco (RM= 2.17; IC95%: 1.49-3.15), alcohol (RM= 2.32; IC95%: 1.77-3.03), sintomatología depresiva (RM= 6.47; IC95%: 4.91-8.51), abuso sexual (RM= 6.76; IC95%: 4.60-9.96). Conclusiones: Debido al incremento de la conducta suicida en adolescentes mexicanos, es necesario implementar políticas públicas preventivas que articulen programas de salud mental, adicciones y violencia.

Abstract: Objective: To estimate the prevalence of suicidal behavior and its association with psychological factors in Mexican adolescents. Materials and methods: Cross-sectional study based on the National Survey of Health and Nutrition (Ensanut 2018-19), with a sample of 17 995 adolescents (10-19 years). Adjusted logistic regression models were estimated, obtaining Odds Ratio (OR) and 95% confidence intervals (95%CI). Results: Prevalence of suicidal ideation and suicide attempt in Mexico were 5.1 and 3.9%, respectively; the highest prevalence was in Guanajuato (ideation: 9.0%, attempt: 7.8%). Associated factors. Suicidal ideation: tobacco (OR= 2.26; 95%CI: 1.62-3.16), alcohol (OR= 2.12; 95%CI: 1.65-2.73), depressive symptoms (OR= 6.04; 95%CI: 4.71-7.73), sexual abuse (OR= 6.57; 95%CI: 4.57-9.45). Suicidal attempt: tobacco (OR= 2.17; 95%CI: 1.49-3.15), alcohol (OR= 2.32; 95%CI:1.77-3.03), depressive symptoms (OR= 6.47; 95% CI: 4.91-8.51), sexual abuse (OR= 6.76; 95%CI: 4.60-9.96). Conclusions: By increasing suicidal behavior in Mexican adolescents, it is necessary to implement preventive public policies that articulate mental health, addiction and violence programs.

Breastfeeding increases microbial community resilience / Aleitamento materno aumenta a resiliência da comunidade microbiana

Abstract Objective Since the present group had already described the composition of the intestinal microbiota of Brazilian infants under low social economic level, the aim of the present study was to analyze the microbial community structure changes in this group of infants during their early life due to external factors. Methods Fecal samples were collected from 11 infants monthly during the first year of life. The infants were followed regarding clinical and diet information and characterized according to breastfeeding practices. DNA was extracted from fecal samples of each child and subjected to Polymerase Chain Reaction - Denaturing Gradient Gel Electrophoresis. Results The results revealed a pattern of similarity between the time points for those who were on exclusive breastfeeding or predominant breastfeeding. Although there were changes in intensity and fluctuation of some bands, the Denaturing Gradient Gel Electrophoresis patterns in the one-year microbial analysis were stable for breastfeeding children. There was uninterrupted ecological succession despite the influence of external factors, such as complementary feeding and antibiotic administration, suggesting microbiota resilience. This was not observed for those children who had mixed feeding and introduction of solid food before the 5th month of life. Conclusion These results suggested an intestinal microbiota pattern resilient to external forces, due to the probiotic and prebiotic effects of exclusive breastfeeding, reinforcing the importance of exclusive breastfeeding until the 6th month of life.

Resumo Objetivo Como nosso grupo já havia descrito a composição da microbiota intestinal de neonatos brasileiros em baixo nível socioeconômico, o objetivo deste estudo foi analisar alterações estruturais da comunidade microbiana desse grupo de neonatos no início de sua vida devido a fatores externos. Métodos Amostras fecais foram coletadas mensalmente de 11 neonatos durante o primeiro ano de vida. Os neonatos foram acompanhados com relação a informações clínicas e nutricionais e caracterizados de acordo com práticas de amamentação. O DNA foi extraído das amostras fecais de cada criança e submetido a análise através da técnica de Reação em Cadeia da Polimerase - Eletroforese em Gel de Gradiente Desnaturante. Resultados Os resultados revelaram um padrão de similaridade entre seus próprios pontos temporais em indivíduos em aleitamento materno exclusivo ou predominante. Apesar de variações na intensidade e flutuação de algumas bandas, o padrão Eletroforese em Gel de Gradiente Desnaturante na análise microbiana de um ano foi estável em crianças em aleitamento materno. Houve sucessão ecológica ininterrupta apesar da influência de fatores externos, como alimentação complementar e administração de antibióticos, sugeriu resiliência da microbiota. Isso não foi observado nas crianças com alimentação heterogênea e introdução de alimentos sólidos antes do quinto mês de vida. Conclusão Nossos resultados sugerem um padrão de microbiota intestinal resiliente a forças externas, devido a efeitos probióticos e prebióticos do aleitamento materno exclusivo, reforçam a importância do aleitamento materno exclusivo até o sexto mês de vida.

Rapid antigen detection test for respiratory syncytial virus diagnosis as a diagnostic tool / Teste rápido de detecção de antígenos para o diagnóstico do Vírus Sincicial Respiratório como ferramenta de diagnóstico

Abstract Objective: The aim of this study was to evaluate the QuickVue® RSV Test Kit (QUIDEL Corp, CA, USA) as a screening tool for respiratory syncytial virus in children with acute respiratory disease in comparison with the indirect immunofluorescence assay as gold standard. In Brazil, rapid antigen detection tests for respiratory syncytial virus are not routinely utilized as a diagnostic tool, except for the diagnosis of dengue and influenza. Methods: The authors retrospectively analyzed 486 nasopharyngeal aspirate samples from children under age 5 with acute respiratory infection, between December 2013 and August 2014, the samples were analyzed by indirect immunofluorescence assay and QuickVue® RSV Test kit. Samples with discordant results were analyzed by real time PCR and nucleotide sequencing. Results: From 313 positive samples by immunofluorescence assays, 282 (90%) were also positive by the rapid antigen detection test, two were positive only by rapid antigen detection test, 33 were positive only by immunofluorescence assays, and 171 were positive by both methods. The 35 samples with discordant results were analyzed by real time PCR; the two samples positive only by rapid antigen detection test and the five positive only by immunofluorescence assays were also positive by real time PCR. There was no relation between the negativity by QuickVue® RSV Test and viral load or specific strain. The QuickVue® RSV Test showed sensitivity of 90%, specificity of 98.8%, predictive positive value of 99.3%, and negative predictive value of 94.6%, with accuracy of 93.2% and agreement κ index of 0.85 in comparison to immunofluorescence assay. Conclusions: This study demonstrated that the QuickVue® RSV Test Kit can be effective in early detection of Respiratory syncytial virus in nasopharyngeal aspirate and is reliable for use as a diagnostic tool in pediatrics.

Resumo Objetivo: Avaliar o teste QuickVue® RSV Test Kit (QUIDEL Corp, CA, EUA) para o diagnóstico rápido do vírus sincicial respiratório em crianças com doença respiratória aguda, comparandoo com a imunofluorescência indireta como padrão ouro. Visto que, no Brasil, testes rápidos para detecção de antígenos para vírus sincicial respiratório não são rotineiramente utilizados como ferramenta de diagnóstico, exceto para Dengue e Influenza. Métodos: Um total de 486 amostras de aspirado de nasofaringe de crianças menores de 5 anos com doença respiratória aguda, coletadas entre dezembro de 2013 e agosto de 2014, foram analisadas por imunofluorescência e pelo teste QuickVue®. Amostras com resultados discordantes entre os métodos foram submetidas a PCR em tempo real e sequenciamento. Resultados: Das 313 amostras positivas por IFI, 282 foram positivas no teste rápido (90%), 2 amostras foram positivas apenas no teste rápido (0.6%), 33 apenas na imunofluorescência (10.5%) e 171 foram negativas em ambos os métodos. As 35 amostras com resultados discordantes foram testadas por PCR em tempo real, sendo que duas que foram positivas apenas no teste rápido e 5 apenas na imunofluorescência confirmaram-se positivas. Não houve relação entre a ausência de positividade no teste QuickVue® com a carga ou com a cepa viral. O teste QuickVue® mostrou sensibilidade de 90.1%, especificidade 98.9%, valor preditivo positivo 99.3%, valor preditivo negativo de 94.6%, acurácia de 93.2% e índice de concordância de 0.85 em comparação à imunofluorescência. Conclusões: Nosso estudo demonstrou que o teste QuickVue® RSV pode ser efetivo na detecção precoce do vírus sincicial respiratório em amostras de aspirado de nasofaringe e é confiável como uma ferramenta de diagnósticos em pediatria.

Anaerobic bacteria in the intestinal microbiota of Brazilian children

OBJECTIVE: Changes in the neonatal gut environment allow for the colonization of the mucin layer and lumen by anaerobic bacteria. The aim of the present study was to evaluate Bifidobacterium, Lactobacillus and Lactococcus colonization through the first year of life in a group of 12 Brazilian infants and to correlate these data with the levels of Escherichia coli. The presence of anaerobic members of the adult intestinal microbiota, including Eubacterium limosum and Faecalibacterium prausnitzii, was also evaluated. METHODS: Fecal samples were collected during the first year of life, and 16S rRNA from anaerobic and facultative bacteria was detected by real-time PCR. RESULTS: Bifidobacterium was present at the highest levels at all of the studied time points, followed by E. coli and Lactobacillus. E. limosum was rarely detected, and F. prausnitzii was detected only in the samples from the latest time points. CONCLUSION: These results are consistent with reports throughout the world on the community structure of the intestinal microbiota in infants fed a milk diet. Our findings also provide evidence for the influence of the environment on intestinal colonization due to the high abundance of E. coli. The presence of important anaerobic genera was observed in Brazilian infants living at a low socioeconomic level, a result that has already been well established for infants living in developed countries.

Diarrheagenic Escherichia coli

ABSTRACT Most Escherichia coli strains live harmlessly in the intestines and rarely cause disease in healthy individuals. Nonetheless, a number of pathogenic strains can cause diarrhea or extraintestinal diseases both in healthy and immunocompromised individuals. Diarrheal illnesses are a severe public health problem and a major cause of morbidity and mortality in infants and young children, especially in developing countries. E. coli strains that cause diarrhea have evolved by acquiring, through horizontal gene transfer, a particular set of characteristics that have successfully persisted in the host. According to the group of virulence determinants acquired, specific combinations were formed determining the currently known E. coli pathotypes, which are collectively known as diarrheagenic E. coli. In this review, we have gathered information on current definitions, serotypes, lineages, virulence mechanisms, epidemiology, and diagnosis of the major diarrheagenic E. coli pathotypes.

Resistencia de HIV-1 a drogas antirretrovirales en gestantes del área metropolitana de Buenos Aires / HIV-1 resistance to antiretroviral drugs in pregnant women from Buenos Aires metropolitan area

Se determinó la frecuencia de mutaciones asociadas a resistencia de HIV-1 a antirretrovirales en embarazadas del área metropolitana de Buenos Aires, 2008-2014. Se incluyeron 136 mujeres con carga viral ≥ 500 copias/ml: 77 (56.6%) eran naïve; las otras 59 (43.4%) eran expuestas, ya sea con tratamiento en curso (n: 24) o previo (n: 35). Se realizó análisis de resistencia genotípica basal en plasma de pacientes naïve y con experiencia de tratamiento antirretroviral. Las mutaciones se identificaron según las listas de la Organización Mundial de la Salud y la International Antiviral Society, respectivamente. Se comparó la frecuencia de mutaciones detectadas en los subperíodos 2008-2011 vs. 2012-2014. Un total de 37 (27.2%) mujeres presentaron ≥ 1 mutación asociada a resistencia: 25/94 (26.5%) en 2008-2011 y 12/42 (28.5%) en 2012-2014 (p > 0.05). Entre las naïve, 15 (19.5%) tenían ≥ 1 mutación: 10/49 (20.4%) en el subperíodo 2008-2011 y 5/28 (17.8%) en 2012-2014 (p > 0.05). Las mutaciones encontradas en pacientes naïve estuvieron asociadas a inhibidores no nucleosídicos de la transcriptasa reversa, y, como en estudios anteriores, K103N fue la más frecuente a lo largo de todo el período. Entre las pacientes expuestas, 22/59 (37.3%) presentaron ≥ 1 mutación asociada a resistencia. Este estudio demuestra una alta frecuencia de mutaciones asociadas a resistencia que se mantuvo estable a lo largo del período. Los niveles detectados sugieren una mayor circulación en nuestro medio de cepas de HIV-1 resistentes a antirretrovirales con respecto a los niveles previamente observados en Argentina.

The study aimed to determine the prevalence of antiretroviral resistance associated mutations in HIV-1 infected pregnant woman treated in Buenos Aires metropolitan area (period 2008-2014). A total of 136 women with viral load ≥ 500 copies/ml were included: 77 (56.6%) were treatment-naïve and 59 (43.4%) were antiretroviral-experienced patients either with current (n: 24) or previous (n = 35) antiretroviral therapy. Genotypic baseline resistance was investigated in plasma of antiretroviral-naïve patients and antiretroviral-experienced patients. The resistance mutations were identified according to the lists of the World Health Organization and the International Antiviral Society, respectively. Frequencies of resistance associated mutations detected in 2008-2011 and 2012-2014 were compared. A total of 37 (27.2%) women presented at least one resistance associated mutation: 25/94 (26.5%) in 2008-2011 and 12/42 (28.5%) in 2012-2014 (p > 0.05). Among naïves, 15 (19.5%) had at least one mutation: 10/49 (20.4%) in the period 2008-2011 and 5/28 (17.8%) in 2012-2014 (p > 0.05). The resistance mutations detected in naïves were associated with non nucleoside reverse transcriptase inhibitors, being K103N the most common mutation in both periods. In antiretroviral experienced patients, 22/59 (37.3%) had at least one resistance mutation. This study demonstrates a high frequency of resistance associated mutations which remained stable in the period analyzed. These levels suggest an increased circulation of HIV-1 antiretroviral resistant strains in our setting compared to previous reports from Argentina.

Diarrheagenic Escherichia coli

Most Escherichia coli strains live harmlessly in the intestines and rarely cause disease in healthy individuals. Nonetheless, a number of pathogenic strains can cause diarrhea or extraintestinal diseases both in healthy and immunocompromised individuals. Diarrheal illnesses are a severe public health problem and a major cause of morbidity and mortality in infants and young children, especially in developing countries. E. coli strains that cause diarrhea have evolved by acquiring, through horizontal gene transfer, a particular set of characteristics that have successfully persisted in the host. According to the group of virulence determinants acquired, specific combinations were formed determining the currently known E. coli pathotypes, which are collectively known as diarrheagenic E. coli. In this review, we have gathered information on current definitions, serotypes, lineages, virulence mechanisms, epidemiology, and diagnosis of the major diarrheagenic E. coli pathotypes.