Spatial distribution of synanthropic triatomines in Piaui State, Northeastern Brazil

• Published in: Revista do Instituto de Medicina Tropical de São Paulo Vol. 62; pp. 1 - 12
• Main Authors: Santos, Jessica Pereira dos, Guimarães, Lucas Melo, Lima, Inácio Pereira, Batista, Francisca Miriane de Araújo, Carvalho-Costa, Filipe Anibal, Santos-Mallet, Jacenir Reis dos
• Format: Journal Article
• Language: English
• Published: São Paulo Instituto de Medicina Tropical de Sao Paulo 01-01-2020; Instituto de Medicina Tropical; Instituto de Medicina Tropical de São Paulo; Universidade de São Paulo (USP)
• Subjects: Chagas disease; Original; Piaui State; Spatial distribution; Triatomines; TROPICAL MEDICINE; Chagas disease; Spatial distribution; Piaui State; Triatomines
• ISSN: 1678-9946; 0036-4665; 1678-9946
• DOI: 10.1590/s1678-9946202062057

This study aimed to describe the spatial distribution and assess entomological indicators of synanthropic triatomines in Piaui State, Northeastern Brazil. We used surveillance data on the detection, identification and assessment of natural infection with trypanosomatids from triatomines in the State from 2014 to 2017. The State was divided into four macroregions. In relation to the dispersion rates of triatomines, they were much lower in the North, when compared to Southwest, Southeast and Central North macroregions. Infestation rates were higher in the Southwest and Southeast and intradomicile infestation rates varied during the study period, reaching high values in all regions. Insects belonging to the species
Triatoma brasiliensis
complex,
Triatoma pseudomaculata, Triatoma sordida
, and to the genus
Panstrongylus
spp. and
Rhodnius
spp. were collected during this period.
T. brasiliensis
was collected from all four regions of the State, but more frequently in those located in the Southeast. A similar pattern was observed for
T. pseudomaculata. T. sordida
was detected in the municipalities in the Southeast and Southwest regions, and less frequently in the Central North municipalities.
Rhodnius
spp. was detected in the Central North and North regions, and
Panstrongylus
spp. in the Central North and Southeast regions. The highest trypanosomatid-positivity rate of
T. brasiliensis
and
Panstrongylus
spp. was in the Southeast region. A significant proportion of the municipalities of Piaui State presents entomological parameters that indicate a risk of Chagas disease by vector transmission.