Dados do Trabalho

Título

Spatiotemporal risk of Trypanosoma cruzi vetorial transmission in Paraná-BRAZIL state, from 2012 to 2021

Introdução

Ecological niche models (ENM) correlates environmental aspects with species occurrence data to define the most suitable characteristics for populational maintenance and can be used to control disease risk areas. An analysis of collected data from 2007 to
2013 by ENM suggested that municipalities in central and northern Paraná have a higher climate and landscape suitability for the occurrence of vectors of Trypanosoma cruzi, the etiological agent of Chagas disease (CD).

Objetivo(s)

To evaluate and compare the areas of vector transmission risk previously predicted by ENM with new triatomine occurrence data from the period 2012 to 2021.

Material e Métodos

The QGIS software (3.22.1) was employed to make risk maps using latitude and longitude data of the municipalities, the triatomine occurrence points and the environmental suitability maps of the State of Paraná created by Ferro e Silva et al. (2018) with climate variables selected and extracted from WorldClim dataset v 1.4 and landscape variables obtained from Earthenv.

Resultados e Conclusão

A total of 1,748 triatomine specimens were found in 43.6% (174/399) of Paraná municipalities, with a general infection rate by T. cruzi of 23.7% (397). The nymphs from the intra-domicile showed a higher rate of positivity 30% (29/61), compared to those from the peridomicile 31% (133/246). The adults, on the other hand, showed a higher infection rate in the intra-domicile 24% (195/676) in relation to the peridomicile 12.8% (58/280). Five species were identified: Panstrongylus megistus (1,399), P. geniculatus (238), Triatoma sordida (58), Rhodnius neglectus (39) and R. prolixus (14). The new occurrences were observed on areas for which suitability values ranged from 0.00 to 1.00 for climate and 0.04 to 0.92 for landscape. The municipalities with higher concentration of new occurrences were in the central, northwestern, northern and northeastern regions of the state, which presented higher environmental suitability ranging from 0.72 to 0.87 and 0.35 to 0.88, respectively for climate and landscape. The same species and order of prevalence were found, showing consistency with predictions and steady trend for risk in the state. The highest occurrences of triatomines were in municipalities of medium to high environmental suitability, showing that the maps generated by ENM from the previous study were good predictors.

Palavras-chave

ENM, climate, landscape, vector transmission, Chagas disease, control.

Área

Eixo 04 | Entomologia / Controle de Vetores