title: [Positivity of xenodiagnosis, according to age, in persons with positive serology for Chagas disease].
abstract: An analytical study of positive xenodiagnosis (XD), according to age distribution, in people with a positive indirect hemagglutination test (IHAT) for Chagas' disease has been carried out. A total of 1,137 IHAT for Chagas' disease positive persons were submitted to two wooden XD boxes containing 7 Triatoma infestans nymphs III each. The positivity (%) of XD in the different age groups was: 0-9 year-old (60.8), 10-19 (35.8), 20-29 (31.5), 30-39 (28.7), 40-49 (30.0), 50-59 (34.3) and > or = 60 (43.3). The 60.8% positivity of XD in children under 10 years of age is possibly due to the rather recent Trypanosoma cruzi infection in this age group and to diverse immunological mechanisms, which decrease with the age increasing.
authors.affiliation: Departamento de Parasitología, Facultad de Medicina, Universidad de Chile, Santiago, Chile.
authors.forename: H
authors.initials: H
authors.lastname: Schenone
authors.forename: M C
authors.initials: MC
authors.lastname: Contreras
authors.forename: A
authors.initials: A
authors.lastname: Rojas
authors.forename: F
authors.initials: F
authors.lastname: Villarroel
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000818:Animals; D014355:Chagas Disease / Q000175:diagnosis* / Q000469:parasitology; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008875:Middle Aged; D010274:Parasitology / Q000379:methods
vernacular_title: Positividad del xenodiagnóstico, según edad, en personas con serología positiva para enfermedad de Chagas.