title: Chagas disease in the Brazilian Amazon: IV. a new cross-sectional study.
abstract: A new conglomerate family sample of 194 dwellings with 996 resident persons were studied in the town of Barcelos, State of Amazonas, in order to re-evaluate the risk of Chagas disease. During the survey the persons were interviewed and in this occasion we showed to them a collection of Panstrongylus, Rhodnius and Triatoma, asking if they recognized and eventually have been bitten by this kind of bugs. At this time we collected 500 ul of blood in microtainer tubes from 886 interviewed persons who gave permission after informed consent. A screening test for T. cruzi antibodies based on agglutination of colored polymer particles, sensitized with three different synthetic peptides of T. cruzi (ID-PaGIA Chagas Test), showed 13.2% of sera positivity, but only 6.8% were confirmed by indirect immunofluorescence, and ELISA with purified T. cruzi antigens. Two hundred and six interviewed persons (20.7%) recognized the triatomines, as "piaçavas' lice" and 62 (30%) confirmed that have been bitten by the bugs, 25.8% of them had a positive serology for T. cruzi infection. Electrocardiographic alterations were shown in 9.3% of the seropositives and in 11.9% of the seronegative cases. This was considered not statistically significant.
authors.affiliation: Instituto Oswaldo Cruz, Fiocruz, Brasil. coura@ioc.fiocruz.br
authors.forename: José Rodrigues
authors.initials: JR
authors.lastname: Coura
authors.forename: Angela Cristina Veríssimo
authors.initials: AC
authors.lastname: Junqueira
authors.forename: Marcio Neves
authors.initials: MN
authors.lastname: Boia
authors.forename: Octavio
authors.initials: O
authors.lastname: Fernandes
authors.forename: Claudina
authors.initials: C
authors.lastname: Bonfante
authors.forename: José Eduardo
authors.initials: JE
authors.lastname: Campos
authors.forename: Lucilaide
authors.initials: L
authors.lastname: Santos
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Devera
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood; D000953:Antigens, Protozoan / Q000097:blood; D001938:Brazil / Q000453:epidemiology; D014355:Chagas Disease / Q000097:blood / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012307:Risk Factors; D012424:Rural Population; D014349:Trypanosoma cruzi / Q000276:immunology
chemical_list: D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan