Studies in search of a suitable experimental insect model for xenodiagnosis of hosts with Chagas' disease. 1 - Comparative xenodiagnosis with nine triatomine species of animals with acute infections by Trypanosoma cruzi

摘要: In search of a suitable vector species for xenodiagnosis humans and animals with chronic Chagas' disease we first investigated the reactions different to acute infection Trypanosoma cruzi. Vector utilized in this study were: Triatoma infestans, Rhodnius prolixus dimidiata, all well adapted human habitats; rubrovaria neglectus both considered totally wild species; Panstrongylus megistus, sordida, pseudomaculata brasiliensis, essentially sylvatic but some domiciliary tendencies others restricted peridomestic biotopes incipient colonization houses after successful eradication T. infestans. Results summarized Table IV suggest following order infectivity among 9 studied species: P. megistus 97.8% infected bugs, 95% positive bugs close second followed by Pseudomaculata 94.3% R. 93.8% almost identical thirds. prolixus, infestans dimidiata exhibited low rates 53.1%, 51.6% 38.2% respectively, coupled sharp decreases occuring aging (Fig. 1). The situation was intermediate brasiliensis sordida being 76.9% 80% respectively. also point existence correlation between prevalence intensity that, high ranging from relatively large proportions insects (27.3% - 33.5%) harbouring very dense populations 53.1% proportion demonstrating comparable parasite densities at most 6%. No differences attributable blood-meal size or greater susceptibility indigenous parasites their own geographical area, as suggested earlier...