title: [A seroepidemiological survey on the island of São Luis during a dengue epidemic in Maranhão].
abstract: The island of São Luis in the State of Maranhão, constituted by the municipalities of São Luis-SL (835,428 inhabitants), São José de Ribamar-SJR (60,633 inhabitants) and Paço do Lumiar-PL (80,274 inhabitants), has been suffering dengue (DEN) fever epidemics since 1995, caused by DEN-1. In 1996, from August through October, an aleatory sero-epidemiologic survey was carried out in order to estimate the incidence of DEN infection and to analyze other clinical and epidemiological parameters. A questionnaire was applied and serum samples were simultaneously obtained. Serum samples were tested by hemagglutination inhibition (HI). Results were analyzed using Lotus 123, Epi-info 6.0, Excel 5.0 and STATA softwares. A total of 1,217 serum samples were obtained (101 of PL, 100 of SJR and 1017 of SL). The rate of DEN was 55.4% in PL, 28% in SJR and 41.4% in SL, suggesting the occurrence of 401,933 infections. No difference was seen between males and females, but infection occurred more in the upper social class than in poor people (p < 0.003), and was more frequent in adults than in children (p < 0.0004). In SL, the incidence was stratified into seven sanitary districts (SD), and prevalence was found to range from 26.1% in SD4 to 56.8% in SD1 (p < 0.0001). Symptoms were more frequently reported by people whose HI was positive: they included fever, headache, chills, dizziness, retrobulbar pains, muscle and joint pains, nausea, anorexia and skin rash. In spite of the high incidence of infection, no hemorrhagic cases were reported.
authors.affiliation: Centro Colaborador, Organização Mundial da Saúde em Arboviroses, Belém, PA, Brasil.
authors.forename: P F
authors.initials: PF
authors.lastname: Vasconcelos
authors.forename: J W
authors.initials: JW
authors.lastname: Lima
authors.forename: M L
authors.initials: ML
authors.lastname: Raposo
authors.forename: S G
authors.initials: SG
authors.lastname: Rodrigues
authors.forename: J F
authors.initials: JF
authors.lastname: da Rosa
authors.forename: S M
authors.initials: SM
authors.lastname: Amorim
authors.forename: E S
authors.initials: ES
authors.lastname: da Rosa
authors.forename: C M
authors.initials: CM
authors.lastname: Moura
authors.forename: N
authors.initials: N
authors.lastname: Fonseca
authors.forename: A P
authors.initials: AP
authors.lastname: da Rosa
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000914:Antibodies, Viral / Q000097:blood; D001938:Brazil / Q000453:epidemiology; D003715:Dengue / Q000175:diagnosis / Q000453:epidemiology* / Q000276:immunology; D003716:Dengue Virus / Q000276:immunology; D004196:Disease Outbreaks / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D011897:Random Allocation; D016036:Seroepidemiologic Studies; D017678:Sex Distribution; D011795:Surveys and Questionnaires
chemical_list: D000914:Antibodies, Viral