Informações sobre a biolojia da vinchuca, Triatoma infestans KLUG

Climatic factors related to Chagas disease transmission

“…Prevalence of vectors in areas with cold winters could be explained by the microclimatic conditions of reservoir habitats, generally many degrees Celsius warmer than the external environment. Similar observations should be made in relation to the Southern hemisphere, where species like T. infestans, T. patagonica Del Ponte, 1929, and T. platensis Neiva, 1913 are found in the Patagonian plateau with low temperatures between -5 and -15 o C during the cold season. In the specific case of T. infestans, its adaptation to the human domestic environment is the best protection against the extreme cold, because dwellings usually have a microclimate with temperatures adapted to human comfort.…”

“…As early as four years after Carlos Chagas original publication of a new pathological entity, Neiva (1913) conducted experimental work to determine the influence of temperature on the evolution of Triatoma infestans embryos. He demonstrated that experimental warming accelerates the embryonic period.…”

Resistência do Triatoma brasiliensis ao jejum

“…Os Triatomíneos são hematófagos obrigatórios em todas as fases de seu ciclo evolutivo, sendo o hematofagismo imprescindível para que haja muda 5,10,13,14 . LWOFF e NICOLLE 13 (1945) mostraram que o Triatoma infestans necessita de sangue como fonte exógena de hamatina, substância que ele não é capaz de sintetizar Geralmente as espécies possuem um hospedeiro preferencial.…”

Comparative developmental and susceptibility to insecticide of Bolivian and Brazilian populations of Triatoma infestans

“…Neiva (1913) studied the development of T. infestans in the laboratory and observed a duration of 220-240 days. Abalos and Wygodzinsky (1951) stated that the egg to adult cycle was completed in 240 days, although Perlowagora-Szumlewicz (1969) was able to rear this species in only 84-134 days at temperatures varying from 20-28ºC.…”

“…In other locations, including Brazil, T. infestans appears to have been introduced by passive dispersal as a predominantly domestic species (Neiva 1913, Dujardin et al 1987, Schofield 1994, and is found only in human dwellings and peridomestic habitats. Dujardin et al (1998) used enzymatic comparisons to demonstrate the limited genetic differences between neighbouring populations of T. infestans, suggesting a recent and relatively rapid dispersal of this species from its presumed Bolivian origin.…”