Strong Host-Feeding Preferences of the Vector Triatoma infestans Modified by Vector Density: Implications for the Epidemiology of Chagas Disease

Chagas disease is a complex zoonosis with more than 150 mammalian host species, nearly a dozen blood-sucking triatomine species as main vectors, and 9–11 million people infected with Trypanosoma cruzi (its causal agent) in the Americas. Triatoma infestans, a highly domesticated species and one of the main vectors, feeds more often on domestic animals than on humans in northern Argentina. The question of whether there are host-feeding preferences among dogs, cats, and chickens is crucial to estimating transmission risks and predicting the effects of control tactics targeting them. This article reports the first host choice experiments of triatomine bugs conducted in small huts under natural conditions. The results demonstrate that T. infestans consistently preferred dogs to chickens or cats, with host shifts occurring more frequently at higher vector densities. Combined with earlier findings showing that dogs have high infection rates, are highly infectious, and have high contact rates with humans and domestic bugs, our results reinforce the role of dogs as the key reservoirs of T. cruzi. The strong bug preference for dogs can be exploited to target dogs with topical lotions or insecticide-impregnated collars to turn them into baited lethal traps or use them as transmission or infestation sentinels

Mapping the linguistic landscapes of the Marshall Islands

This paper examines code choices in the written linguistic landscape of the Republic of the Marshall Islands (RMI). Due to a history of language imposition, the Marshall Islanders have long been denied the opportunity to express their linguistic identity in the public domain. A recently proposed bilingual language policy, which requires all public signs to be Marshallese-English bilingual, aims to change this status quo. We map language choices in the linguistic landscape of the RMI at the cusp of this policy with an eye on the stakeholders, production processes, and audiences involved in the creation and reception of the linguistic landscape. State-of-the-art geographical and regression analyses model the factors that govern code choices in the linguistic landscape of the RMI. Our findings allow us to pinpoint niches - both geographical as well as social - where the Marshallese assert their linguistic identity in the public realm