Triatoma gerstaeckeri (Hemiptera: Reduviidae) infectada con Trypanosoma cruzi en Nuevo León, México y patogenicidad de la cepa regional

Abstract

Introduction: Four species of triatomines have been reported in Nuevo León, northeast (NE) México, but Triatoma gerstaeckeri has only been recorded from a peridomestic dwelling. Objectives: To assess the natural infection index (NII) of Trypanosoma cruzi in triatomines and the infestation index (II) of T. gerstaeckeri collected in a suburban locality, and to collect histopathological data to understand tissue tropism of the regional T. cruzi strain (strain NE) obtained from the vectors collected after an experimental inoculation in Mus musculus. Materials and methods: Triatomines were collected from 85 houses and peridomiciles in Allende, Nuevo León. Stool samples were obtained to determine the T. cruzi NII and were used in an experimental mice infection. Results: A total of 118 T. gerstaeckeri were captured, and 46 (adults and nymphs) were collected inside the same house (II=1.17%). Thirty-seven reduvids were infected with T. cruzi (NII=31.3%). Tissue tropism of the T. cruzi NE strain was progressive in skeletal muscle, myocardial, and adipose tissues and was characterized by the presence of intracellular amastigotes and destruction of cardiac myocells. Conclusions:The presence of naturally infected domiciliary vectors is an important risk factor for public health in the region considering that these vectors are the principal transmission mechanism of the parasite. The T. cruzi NE strain has similar virulence to that of other Mexican and Texan strains and caused chagasic infections in 11 of 12 mice.

Nuevos registros de triatominos (Hemiptera: Reduviidae: Triatominae) en el municipio de General Zuazua, Nuevo León, México

“…Por muchos años hubo solo registros geográficos esporádicos de especies de triatominos en el noreste del país (revisar referencia 11 ver para citas puntuales). Posteriormente, estudios realizados en el estado de Nuevo León (12)(13)(14)(15)(16)(17), han documentado los índices de domicilio, de colonización, infección de especies de triatominos asociadas a las viviendas humanas en varios municipios del estado. A la fecha en Nuevo León, existen reportes de triatominos en 23 de los 51 municipios del estado, siendo éstos: Agualeguas, Allende, Anáhuac, Apodaca, Bustamante, Cadereyta, Cerralvo, China, Ciénega de Flores, Dr. Coss, Dr. González, Galeana, General Bravo, General Terán, Guadalupe, Linares, Los Ramones, Mina, Monterrey, Sabinas Hidalgo, San Nicolás, Santiago y Villaldama y las especies hasta ahora registradas son: Triatoma gerstaeckeri, Triatoma indictiva, Triatoma neotomae, Triatoma protracta, Triatoma rubida y Paratriatoma lecticularia.…”