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Parasitología al día

versión impresa ISSN 0716-0720


CALDERON-ARGUEDAS, OLGER; CHINCHILLA, MÍSAEL; GARCIA, FERNANDO  y  VARGAS, MARIO. BLOOD SOURCES OF Triatoma dimidiata (Hemiptera: Reduvidae) IN THE CENTRAL PLATEAU OF COSIA RICA AT THE END OF THE XX CENTURY. Parasitol. día [online]. 2001, vol.25, n.3-4, pp.78-81. ISSN 0716-0720.

267 kissing hugs Triatoma dimidiata (Hemiptera: Reduvidae) were collected in peridomestic habitats located in tthree Chagas' disease epidemiological regions of the Central plateau of Costa Rica. Gut extract were prepared from each triatomine. They were assayed in an immuno double-diffusion system (Outcherlony) for detecting the presence of different kind of vertebrate bloods. Trypanosoma cruzi infection was also tested by microscopical observation of fecal smear. 67.0% of the samples were positive for human blood, that was the most important food source for the insect (p < 0.05). Dog was another important host and the blood was found in 49.8% of the samples. Rat, mouse, didelphid and chicken bloods were positive in porcentajes under 15.0%. The data can not demostrate that T. dimidata has special preferences for the avian blood. However, when the data are evaluated as exhausted and excluyent categories, chicken blood represents the second in frequency (9.0%). It could means that T. dimidata can choose the chickens as host, when humans or dogs are not available. The T. cruzi infection rate was higher in insects that were positive by opposum and rodent bloods. It suggest the role that these kind of animals can play as selvatic and domestic T. cruzi reservoirs.

Palabras clave : Triatoma dimidiata; Hemíptera; Trypanosoma cruzi; Chagas `disease; Costa Rica.

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