A Three-Year Follow-Up Study of Infection with Trypanosoma Cruzi and Electrocardiographic Abnormalities in a Rural Community in Northeast Brazil

James H. MaguireDepartment of Tropical Public Health, Harvard School of Public Health, Boston, Massachusetts 02115

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Kenneth E. MottDepartment of Tropical Public Health, Harvard School of Public Health, Boston, Massachusetts 02115

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Rodney HoffDepartment of Tropical Public Health, Harvard School of Public Health, Boston, Massachusetts 02115

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Armenio GuimarãesDepartment of Cardiology, Hospital Professor Edgard Santos, Federal University of Bahia, Nucleo de Pesquisas, Salvador, Bahia, Brazil

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José T. FrancaFundação Oswaldo Cruz (F.O.C.), Salvador, Bahia, Brazil

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José Antonio Almeida de SouzaDepartment of Cardiology, Hospital Professor Edgard Santos, Federal University of Bahia, Nucleo de Pesquisas, Salvador, Bahia, Brazil

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Nilson Borges RamosDepartment of Cardiology, Hospital Professor Edgard Santos, Federal University of Bahia, Nucleo de Pesquisas, Salvador, Bahia, Brazil

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Italo A. SherlockFundação Oswaldo Cruz (F.O.C.), Salvador, Bahia, Brazil

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The relationship between parasitemia, seroreactivity to Trypanosoma cruzi, and electrocardiographic abnormalities was studied in 115 individuals from a rural community in northeast Brazil where Chagas' disease is endemic. Vector control measures were introduced, and after 3 years 106 of the original participants were located and re-examined. Serum antibodies to T. cruzi were measured by complement fixation and indirect fluorescent antibody tests and parasitemia by xenodiagnosis and blood cultures. On both examinations more seropositive children than seropositive adults showed parasitemia, and parasitemia was more likely to persist over the 3-year period in younger individuals. Electrocardiographic (ECG) abnormalities were seen more frequently in seropositive individuals without parasitemia. However, ECG abnormalities, as expected, were more prevalent in older individuals and therefore no specific inverse relationship between ECG findings and parasitemia could be shown. The decreased prevalence of infection noted in younger individuals following the introduction of vector control measures indicates that this approach limited transmission.

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