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Revista do Instituto de Medicina Tropical de São Paulo
On-line version ISSN 1678-9946
MONTOYA, Roberto; DIAS, João Carlos Pinto and COURA, José Rodrigues. Chagas disease in a community in Southeast Brazil: I. A serlogic follow-up study on a vectorcontrolled area. Rev. Inst. Med. trop. S. Paulo [online]. 2003, vol.45, n.5, pp. 269-274. ISSN 1678-9946. http://dx.doi.org/10.1590/S0036-46652003000500006.
The prevalence of Trypanosoma cruzi infection was evaluated in Berilo, Minas Gerais (MG), Brazil, from January to July 1997. A serological survey using the indirect immunofluorescence test (IFT) in dried blood collected on filter-paper was performed in a sample of 2,261 individuals. The overall prevalence rate of T. cruzi infection was 18%, and reached 50% in individuals older than 30 years from rural areas. The percentage of seropositivity was 0.17% among individuals younger than 10 years old, suggesting that vectorial transmission is controlled in the area. A decrease in prevalence rates among people born after 1960 and 1970 was observed and this appears to be correlated with the beginning of control programs. A reduction in T. cruzi infection rates was observed when comparing our results with the rates estimated in a serologic study carried out in Berilo in 198311.
Keywords : T. cruzi infection; Chagas' disease prevalence; Epidemiology; Vectorial control; Chagas disease transmission.