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Trypanosoma Cruzi Infection in Dogs and Cats and Household Seroreactivity to T. Cruzi in a Rural Community in Northeast Brazil^*,,

Kenneth E. Mott, Eduardo A. Mota, Italo Sherlock, Rodney Hoff, Tacito M. Muniz, Tome S. Oliveira AND C. C. Draper

The prevalence of Trypanosoma cruzi parasitemia as determined by xenodiagnosis on domestic dogs and cats was correlated with household rates of seroreactivity to T. cruzi and household Panstrongylus megistus infestation in a rural area in northeast Brazil where P. megistus was the only domiciliary triatomine vector. T. cruzi infection was present in about 18% of domestic dogs and cats. Two-thirds of seroreactive children below age 10 resided in houses with T. cruzi-infected animals. In houses with a T. cruzi-infected dog or cat, as well as at least one infected P. megistus, the household rate of seroreactivity to T. cruzi was five times greater than in houses with non-infected domestic animals and no infected triatomine vectors. Domestic dogs and cats are important reservoirs of T. cruzi in an endemic area where P. megistus is the only domiciliary triatomine vector.

Accepted for publication May 6, 1978.

^* Presented at the XII Congresso da Sociedade Brasileira de Medicina Tropical, Belém, Pará, 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.

Dr. Mota was the recipient of an ICOMI-UFBa fellowship during this project.

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