Mar 25, 2020

Elucidating the mechanism of Trypanosoma cruzi acquisition by triatomine insects: evidence from a large field survey of Triatoma infestans

BioRxiv : the Preprint Server for Biology
Aaron TustinMichael Z Levy


Blood-sucking triatomine bugs transmit the protozoan parasite Trypanosoma cruzi, the etiologic agent of Chagas disease. We measured the prevalence of T. cruzi infection in 58,519 Triatoma infestans captured in residences in and near Arequipa, Peru. Among bugs from infected colonies, T. cruzi prevalence increased with stage from 12% in second instars to 36% in adults. Regression models demonstrated a linear relationship between infection prevalence and developmental stage. Prevalence increased by 5.4 percentage points with each additional stage. We postulate that the probability of acquiring the parasite may be related to the number of feeding events. Transmission of the parasite does not appear to be correlated with the amount of blood ingested during feeding. Similarly, other hypothesized transmission routes such as coprophagy fail to explain the observed pattern of prevalence. Our results could have implications for the feasibility of late-acting control strategies that preferentially kill older insects.

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Mentioned in this Paper

Spatial Distribution
Disease Transmission
Antisocial protein, Drosophila
Population Group

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