Spatial distribution of synanthropic triatomines in Piaui State, Northeastern Brazil

Abstract

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Spatial analysis of the natural infection index for Triatomines and the risk of Chagas disease transmission in Northeastern Brazil

“…In contrast, R. nasutus was found in municipalities in Sertao, with a single record of positivity in our study. This finding is consistent with previous studies demonstrating its presence in semi-arid areas and the Caatinga biome 17 , 29 .…”

“…P. lutzi was found to be spread across four mesoregions; the Metropolitan region was the only region with no records of this species. Previous studies 17 , 29 conducted in Northeastern Brazil have reported the presence of this species mainly in the semi-arid regions of the Agreste region, with its absence noted in the coastal areas; these findings are similar to our findings, and the species is still considered wild 2 , 17 . In contrast, R. nasutus was found in municipalities in Sertao, with a single record of positivity in our study.…”

“…In our study, 7,302 vector insects were collected between January 2016 and December 2018; however, we detected only a small number of P. megistus . This result corroborates results of previous studies conducted in the Northeastern region 29 , 30 and differs from studies conducted in the Southeastern 32 and Southern regions of Brazil 16 . This may be related to the chemical control used to eliminate triatomines in the household environments in the various regions 33 ; however, the NNI for Trypanosoma sp.…”

“…The T. brasiliensis and T. pseudomaculata species were the most frequent in the study, indicating their vector potential in endemic regions, especially in or near households in rural areas 2 , 29 . In our study, these vectors were naturally infected in the Agreste and Sertao regions; these results are consistent with results from other studies conducted in Northeastern Brazil 29 , 30 .…”

Occurrence and spatial distribution of triatomines (Hemiptera: Reduviidae) in the urban area of the municipality of Montes Claros, Northern Minas Gerais, Brazil

“…The occurrence of native species of triatomines in the urban home environment of Montes Claros ratifies the potential for vector transmission of T. cruzi in the endemic region of northern Minas Gerais (Galvão, 2014). The presence of triatomines in urban areas has been shown in other studies carried out in Brazil (Dias, Queiroz, Diotaiuti, et al., 2016; Dias, Queiroz, Martins, et al., 2016; Ribeiro et al., 2016; Santos et al., 2020), Peru (Khatchikian et al., 2015), Mexico (Tamay‐Segovia et al., 2017) and Argentina (Gaspe et al., 2020; Provecho et al., 2021; Vallve et al., 1996) where an occurrence of T. infestans infected with T. cruzi was observed in the urban area (Provecho et al., 2021).…”