Chagas disease, which is caused by the parasite . Trypanosoma cruzi, is transmitted to humans by blood-sucking bugs (Triatominae). . Eratyrus mucronatus is a well-dispersed triatomine species, found sometimes in dwellings. In the Apolo region of Bolivia, people continue to complain of bites by this bug despite five years of chemical control. For the first time, the domiciliation process of . E. mucronatus was evaluated in a zone treated by insecticide, and it was compared with a previous situation 14 years ago. Both an entomological and a serological study were carried out: 152 dwellings were visited and 491 blood samples were analyzed with Stat-Pack and ELISA tests. In 34 dwellings (23% of the total visited dwellings), 160 triatomines of all stages were collected belonging to two species, . E. mucronatus (98% of the capture) and . Panstrongylus geniculatus. A domiciliation of . E. mucronatus is demonstrated, particularly in the peridomicile. Bugs were captured more frequently in bedrooms in the intradomicile, and in curahuas (boundary walls in rammed mud) in the peridomicile. A . P. geniculatus adult was found infected with . T. cruzi. No evidence of a local vectorial transmission was found. In particular, the limited effect of the insecticide on the presence of . E. mucronatus and the role of the curahuas as a source of intrusion/domiciliation process are discussed.
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We thank the teams of the Chagas Department of the SEDES La Paz and of the Medical Entomology Laboratory of the INLASA for their collaboration in the field and laboratory studies. We thank the Ministry of Public Health and Sports of Bolivia (Project of Fight against Great Endemics), IRD for financial and logistical support. We thank J. Schweizer for her helpful correction of English.