title: Rubella seroepidemiology in a non-immunized population of São Paulo State, Brazil.
abstract: A rubella serological survey of 476 individuals selected by cluster sampling technique from Caieiras, a small town located in the outskirts of São Paulo city, southeastern Brazil, was carried out over the period November 1990-January 1991. The aim of the study was to characterize rubella epidemiology in a representative non-immunized community in south east Brazil. The survey comprised a seroprevalence study, stratified by age (0-40 years) and a seroconversion study of rubella vaccine in non-infected children below 2 years of age. Mathematical techniques were applied to resultant data sets to determine the age dependent rates of decay in the proportion of individuals with maternally derived antibodies, vaccine seroconversion, and infection of susceptibles, termed the force of infection, and to estimate the average age at first infection.
authors.affiliation: Faculdade de Medicina, Universidade de São Paulo, Brazil.
authors.forename: R S
authors.initials: RS
authors.lastname: De Azevedo Neto
authors.forename: A S
authors.initials: AS
authors.lastname: Silveira
authors.forename: D J
authors.initials: DJ
authors.lastname: Nokes
authors.forename: H M
authors.initials: HM
authors.lastname: Yang
authors.forename: S D
authors.initials: SD
authors.lastname: Passos
authors.forename: M R
authors.initials: MR
authors.lastname: Cardoso
authors.forename: E
authors.initials: E
authors.lastname: Massad
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000914:Antibodies, Viral / Q000097:blood*; D001938:Brazil / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D016000:Cluster Analysis; D006801:Humans; D007112:Immunity, Maternally-Acquired; D007223:Infant; D007231:Infant, Newborn; D016013:Likelihood Functions; D015995:Prevalence; D012409:Rubella / Q000453:epidemiology* / Q000276:immunology / Q000517:prevention & control; D012411:Rubella Vaccine / Q000276:immunology; D012412:Rubella virus / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral; D012411:Rubella Vaccine; C040901:rubella antibodies