Although laboratory rearing imposes a certain degree of selection pressure on aspects of insect biology, all studied cohorts from recently colonized triatomines
were exposed to the standardized environmental conditions that were favourable to their survival; hence, it was assumed that estimates of life-table parameters derived from data collected from the colonized wild strains represent a maximum expression of their life-table parameters and are likely to reflect true differences between geographically isolated strains.
were identified using taxonomic keys by Lent and Wygodzinsky (19) (Figure 5).
Risk factors for reinvasion of human dwellings by sylvatic triatomines
in northern Bahia State, Brazil.
Trypanosoma cruzi is a heteroxenous flagellate exhibiting a sylvatic transmission cycle vectored to mammalian reservoir species by triatomine
insects, blood-feeding reduviids which defecate infective trypomastigotes onto the skin, coat, or nests of host species.
8%, followed by the raccoon (Procyon lotor), found in nearly 30% of triatomines
Collected adult triatomines
and first and fifth instars were identified according to Lent and Wygodzinsky (13).
cruzi to dogs, considering the diversity of triatomine
vectors, reservoir hosts, and previous documentation of canine disease (5,7).
can survive for months in harvested crops; thus, multiple hygiene interventions are potentially necessary along the food production line (14).
Feeding behavior of triatomines
from the southwestern United States: an update on potential risk for transmission of Chagas disease.
In Arizona, humans may be at a greater risk for vectorial transmission of the disease than previously thought because human populations are rapidly expanding into habitats where infected triatomines
(20-22) and wild mammalian reservoirs such as packrats, mice, armadillos, raccoons, and opossums (23-27) are plentiful.
Oral transmission occurs by consumption of foods contaminated with triatomines
or their feces or by consumption of raw meat from infected mammalian sylvatic hosts (3).
In the Brazilian Amazon region, where domiciled triatomines
have not been reported, human cases of Chagas disease have been increasing (2).