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House Construction, Triatomine Distribution, and Household Distribution of Seroreactivity to Trypanosoma Cruzi in a Rural Community in Northeast Brazil^*,,

Household distribution of seroreactivity to Trypanosoma cruzi in inhabitants was analyzed in relation to house construction and the distribution of Panstrongylus megistus, the principal domestic vector of Chagas' disease in a rural area in northeast Brazil. No children residing in mud-brick houses were seroreactive to T. cruzi. The highest rates of seroreactivity occurred in residents of unplastered mud-stick houses, and were twice as high as those found in persons living in mud-brick houses or plastered mud-stick houses. Two-thirds of seroreactive children in this area resided in unplastered mud-stick houses. Over 90% of the P. megistus infestations were found in mud-stick houses. Mud-brick houses had the lowest infestation rates of P. megistus and the lowest household rates of seroreactivity to T. cruzi.

Accepted for publication May 6, 1978.

^* Presented at the XII Congresso da Sociedade Brasileira de Medicina Tropical, Belem, Para, Brazil, 15–19 February 1976.

Address reprint requests to: Dr. Thomas H. Weller, Department of Tropical Public Health, Harvard School of Public Health, Boston, Massachusetts 02115.

The Harvard component, under the direction of Dr. Thomas H. Weller, is supported by a grant from The Wellcome Trust, and its collaborative activities in Brazil are under the aegis of the Pan American Health Organization.

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