title: Occurrence of influenza among patients hospitalized for suspicion of influenza A (H1N1) infection in 2010 at a sentinel hospital in São Paulo, Brazil.
abstract: In 2010, 96 patients suspected of being infected with the influenza A (H1N1) virus were hospitalized at the Hospital São Paulo, located in the city of São Paulo, Brazil. Of those 96 patients, 4 (4.2%) were found to be infected with influenza A virus-3 with influenza A (H1N1) and 1 with seasonal influenza A-and 2 patients (2.1%) were found to be infected with influenza B virus. Most (63.5%) of the suspected cases occurred in children, as did half of the positive cases. The second wave of influenza A (H1N1) infection was weaker in São Paulo. The decrease in the number of hospitalizations for H1N1 infection in 2010 might be attributable to vaccination.
authors: Virology Laboratory, Infections Diseases Branch, Medicine Department, Federal University of São Paulo, São Paulo, Brazil.
authors: Thaís Boim
authors: TB
authors: Melchior
authors: Sandra Baltazar
authors: SB
authors: Guatura
authors: Clarice Neves
authors: CN
authors: Camargo
authors: Aripuanã Sakurada Aranha
authors: AS
authors: Watanabe
authors: Celso
authors: C
authors: Granato
authors: Nancy
authors: N
authors: Bellei
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D001938:Brazil / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D053118:Influenza A Virus, H1N1 Subtype / Q000302:isolation & purification*; D007251:Influenza, Human / Q000145:classification / Q000453:epidemiology* / Q000517:prevention & control; D008297:Male; D008875:Middle Aged; D018571:Sentinel Surveillance; D013997:Time Factors; D014611:Vaccination / Q000592:standards; D055815:Young Adult