Indicadores de infestación, colonización e infección de Triatoma dimidiata (Latreille) (Hemiptera: Reduviidae) en Campeche, México

Abstract

Indicators of Infestation, Colonization and Infection of Triatoma dimidiata (Latreille) (Hemiptera:Reduviidae) in Campeche, México ABSTRACT -Triatoma dimidiata (Latreille) is considered to be one of the primary vectors of Chagas disease in Southern Mexico and Central America. The objective of the present study was to obtain ecological information on T. dimidiata in two rural communities of Campeche, Mexico, where the vector is poorly studied. Our work consisted of monthly samplings carried out during one-year time at three levels: sylvatic, peridomestic and intradomestic, in order to estimate the population abundance of this species and its rate of infection with Trypanosoma cruzi. Triatoma dimidiata was the unique vector of this disease collected in San Juan Bautista Sakcabchen (SJBS) and Crucero San Luis (CSL). The total of 145 individuals were captured in SJBS; from these, 26.9%, 20% and 53.1% were collected in the sylvatic, peridomestic and intradomestic area, respectively. In CSL captures yielded 108 individuals: 40.7% in the sylvatic area, 20.4% peridomestic and 38.9% intradomestic. We found no correlation between climatic variables and population abundance of T. dimidiata. Dataset obtained suggests that individuals from the sylvatic area exhibit a high rate of natural infection by T. cruzi, with monthly percentages up to 61.5% for SJBS and 50% for CSL. At the peri and intradomestic level, the reservoirs apparently play an important role in the transmission, as the seroprevalence in dogs was 61.5% y 65.4%, for SJBS y CSL, respectively. Based on these fi ndings, it was concluded that inhabitants of both communities are at a high risk of Chagas disease infection.

Presence of Virginia opossum (Didelphis virginiana) and Pic (Triatoma dimidiata) infected with Trypanosoma cruzi in urban areas: preliminary evaluation in the city of Campeche, Mexico

“…The months reporting higher capture, registering 66% (24/36), were those corresponding to the dry season (March-April). This is the only arthropod vector reported for the Campeche state, which seems to be more abundant during the dry season, as reported by Ruiz Piña and CruzReyes (2002) and Hernández et al (2010). Activities of both reservoirs coincide on the dry season.…”

High Frequency of Human Blood in Triatoma dimidiata Captured Inside Dwellings in a Rural Community in the Yucatan Peninsula, Mexico, but Low Antibody Seroprevalence and Electrocardiographic Findings Compatible with Chagas Disease in Humans

“…10 However, colonization was very low (less than 5%). These data may support the notion that T. dimidiata is rather a visiting vector than a domiciliated vector.…”

“…Previous studies in this community indicated that intradomestic infestation in the months between April and June (months that correspond to hot and dry season) can reach up to 53%, and the infection index can reach 20%; however, the colonization index is below 5%. 10 The above data suggest that inhabitants of this community could be at risk of Trypanosoma cruzi infection and Chagas disease.…”

Triatoma dimidiata in Colombia. Distribution, ecology and its epidemiological importance

“…Las condiciones climáticas también inciden en el número de insectos capturados durante el año, el cual aumenta en las temporadas secas, que en Centroamérica corresponden a los meses de marzo y septiembre (68,69). En algunos estudios, se ha examinado la relación entre las variables climáticas y la presencia de T. dimidiata utilizando sistemas de información geográfica y los parámetros registrados en las estaciones.…”