Resumo

PEREZ R, Ana Gisela; MORENO, Jorge E  e  COLINA, Luisa. Comparative study of susceptibility of four species of genera Rhodnius to experimental infection with Trypanosoma cruzi in Venezuela. Bol Mal Salud Amb [online]. 2009, vol.49, n.1, pp.135-142. ISSN 1690-4648.

In order to compare their susceptibility to Trypanosoma cruzi specimens of Rhodnius prolixus, R. robustus, R. neivai and R. neglectus were experimentally infected with this parasite. Statistically significant differences among the species in the volume of blood ingested, volume of urine produced and number of parasites in urine and grounds developed in each stage, were detected with a non parametric Kruskall-Wallis analysis of variance, with the data grouped in species and instars. The Low Significative Difference posteriori test, shows that R. prolixus ingested the highest blood volume while R. neivai produced the highest urine volume, followed by R. robustus, R. prolixus and R. neglectus. Likewise, R. neivai showed the highest average of parasites in urine and feces, while R. robustus and R. neglectus showed significantly less parasites in urine and feces respectively. The four studied species are able to infect, to multiply and to excrete the parasite in their infective form in all instars stages.

Palavras-chave : Rhodnius; Trypanosoma cruzi; experimental infection; Chagas; Venezuela.