The authors describe the first autochthonous acute cases of Chagas' disease in the State of Maranhão. Three casesfrom the island of São Luís and the fourth from Bacurituba, in the low land area of the State. The results of indirect immunofluorescence test in 213 inhabitants ofSão Luís have shown 3 (1,4%) positive.
Chagas' disease; Maranhão; Seroepidemiology