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Seasonality of distinct respiratory viruses in a tropical city: implications for prophylaxis.
Santos, Ruth-Kelly O; Borges, Igor C; Souza, Mariana L; Bouzas, Maiara L; Nascimento-Carvalho, Cristiana M.
Afiliación
  • Santos RO; Postgraduate Program in Health Sciences, Federal University of Bahia School of Medicine, Salvador, Brazil.
  • Borges IC; Epidemiology Unit, Health Secretariat, Salvador, Brazil.
  • Souza ML; Postgraduate Program in Health Sciences, Federal University of Bahia School of Medicine, Salvador, Brazil.
  • Bouzas ML; Epidemiology Unit, Health Secretariat, Salvador, Brazil.
  • Nascimento-Carvalho CM; Postgraduate Program in Health Sciences, Federal University of Bahia School of Medicine, Salvador, Brazil.
Trop Med Int Health ; 26(6): 672-679, 2021 06.
Article en En | MEDLINE | ID: mdl-33666303
OBJECTIVE: The frequency and seasonality of viruses in tropical regions are scarcely reported. We estimated the frequency of seven respiratory viruses and assessed seasonality of respiratory syncytial virus (RSV) and influenza viruses in a tropical city. METHODS: Children (age ≤ 18 years) with acute respiratory infection were investigated in Salvador, Brazil, between July 2014 and June 2017. Respiratory viruses were searched by direct immunofluorescence and real-time polymerase chain reaction for detection of RSV, influenza A virus, influenza B virus, adenovirus (ADV) and parainfluenza viruses (PIV) 1, 2 and 3. Seasonal distribution was evaluated by Prais-Winsten regression. Due to similar distribution, influenza A and influenza B viruses were grouped to analyse seasonality. RESULTS: The study group comprised 387 cases whose median (IQR) age was 26.4 (10.5-50.1) months. Respiratory viruses were detected in 106 (27.4%) cases. RSV (n = 76; 19.6%), influenza A virus (n = 11; 2.8%), influenza B virus (n = 7; 1.8%), ADV (n = 5; 1.3%), PIV 1 (n = 5; 1.3%), PIV 3 (n = 3; 0.8%) and PIV 2 (n = 1; 0.3%) were identified. Monthly count of RSV cases demonstrated seasonal distribution (b3 = 0.626; P = 0.003). More than half (42/76 [55.3%]) of all RSV cases were detected from April to June. Monthly count of influenza cases also showed seasonal distribution (b3 = -0.264; P = 0.032). Influenza cases peaked from November to January with 44.4% (8/18) of all influenza cases. CONCLUSIONS: RSV was the most frequently detected virus. RSV and influenza viruses showed seasonal distribution. These data may be useful to plan the best time to carry out prophylaxis and to increase the number of hospital beds.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Estaciones del Año / Infecciones por Virus Sincitial Respiratorio / Infecciones por Paramyxoviridae / Gripe Humana Tipo de estudio: Incidence_studies / Observational_studies / Prevalence_studies / Prognostic_studies / Risk_factors_studies Límite: Child, preschool / Female / Humans / Infant / Male País/Región como asunto: America do sul / Brasil Idioma: En Revista: Trop Med Int Health Asunto de la revista: MEDICINA TROPICAL / SAUDE PUBLICA Año: 2021 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Reino Unido

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Estaciones del Año / Infecciones por Virus Sincitial Respiratorio / Infecciones por Paramyxoviridae / Gripe Humana Tipo de estudio: Incidence_studies / Observational_studies / Prevalence_studies / Prognostic_studies / Risk_factors_studies Límite: Child, preschool / Female / Humans / Infant / Male País/Región como asunto: America do sul / Brasil Idioma: En Revista: Trop Med Int Health Asunto de la revista: MEDICINA TROPICAL / SAUDE PUBLICA Año: 2021 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Reino Unido