title: Detection and molecular characterization of group A rotavirus from hospitalized children in Rio de Janeiro, Brazil, 2004.
abstract: Rotavirus is a major cause of infantile acute diarrhea, causing about 440,000 deaths per year, mainly in developing countries. The World Health Organization has been recommending the assessment of rotavirus burden and strain characterization as part of the strategies of immunization programs against this pathogen. In this context, a prospective study was made on a sample of 134 children with acute diarrhea and severe dehydration admitted to venous fluid therapy in two state hospitals in Rio de Janeiro, Brazil, from February to September 2004. Rotavirus where detected by polyacrylamide gel electrophoresis (PAGE) and by an enzyme-linked immunoassay to rotavirus and adenovirus (EIARA) in 48% of the children. Positive samples for group A rotavirus (n = 65) were analyzed by reverse transcription/heminested multiplex polymerase chain reaction to determine the frequency of G and [P] genotypes and, from these, 64 samples could be typed. The most frequent G genotype was G1 (58%) followed by G9 (40%). One mixed infection (G1/G9) was detected. The only [P] genotype identified was [8]. In order to estimate the rotavirus infection frequency in children who acquired diarrhea as hospital infection in those hospitals, we studied 24 patients, detecting the pathogen in 41% of them. This data suggest that genotype G9 is an important genotype in Rio de Janeiro, with implications to the future strategies of vaccination against rotavirus, reinforcing the need of continuous monitoring of circulating strains of the pathogen, in a surveillance context.
authors.affiliation: Laboratório de Virologia Comparada, Departamento de Virologia, Instituto Oswaldo Cruz-Fiocruz, RJ Brasil.
authors.forename: Filipe Anibal
authors.initials: FA
authors.lastname: Carvalho-Costa
authors.forename: Rosane Maria
authors.initials: RM
authors.lastname: Assis
authors.forename: Alexandre Madi
authors.initials: AM
authors.lastname: Fialho
authors.forename: Márcio Neves
authors.initials: MN
authors.lastname: Bóia
authors.forename: Daniele Pires Dias
authors.initials: DP
authors.lastname: Alves
authors.forename: Carolina Maria Miranda de Assis
authors.initials: CM
authors.lastname: Martins
authors.forename: José Paulo Gagliardi
authors.initials: JP
authors.lastname: Leite
mesh_terms: D000208:Acute Disease; D001938:Brazil; D002648:Child; D002675:Child, Preschool; D005243:Feces / Q000821:virology; D005759:Gastroenteritis / Q000821:virology*; D005838:Genotype; D006760:Hospitalization; D006801:Humans; D007223:Infant; D011446:Prospective Studies; D012367:RNA, Viral / Q000302:isolation & purification; D012401:Rotavirus / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification; D012400:Rotavirus Infections / Q000821:virology*; D012720:Severity of Illness Index
chemical_list: D012367:RNA, Viral