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TRIATOMA WILLIAMI IN INTRADOMICILIARY ENVIRONMENTS OF URBAN AREAS IN MATO GROSSO STATE, BRAZIL: DOMICILIATION PROCESS OF A WILD SPECIES?
Triatomíneos
Colonização
Doença de Chagas
Programa de vigilância
Triatoma williami
Triatoma williami
Colonization
Trypanosoma cruzi
Chagas disease
Surveillance program
Author
Affilliation
Secretaria Estadual de Saúde de Mato Grosso. Departamento de Vigilância em Saúde Ambiental. Barra das Garças, MT, Brasil.
Secretaria Estadual de Saúde de Mato Grosso. Departamento de Vigilância em Saúde Ambiental. Barra das Garças, MT, Brasil.
Universidade de São Paulo. Faculdade de Saúde Pública. Laboratório de Entomologia em Saúde Pública. São Paulo, SP, Brasil.
Universidade Federal de Mato Grosso. Laboratório de Entomologia em Saúde Pública. Barra das Garças, MT, Brasil.
Universidade Federal de Mato Grosso. Laboratório de Entomologia em Saúde Pública. Barra das Garças, MT, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório Nacional e Internacional de Referência em Taxonomia Triatomineos. Rio de Janeiro, RJ, Brasil.
Secretaria Estadual de Saúde de Mato Grosso. Departamento de Vigilância em Saúde Ambiental. Barra das Garças, MT, Brasil.
Universidade de São Paulo. Faculdade de Saúde Pública. Laboratório de Entomologia em Saúde Pública. São Paulo, SP, Brasil.
Universidade Federal de Mato Grosso. Laboratório de Entomologia em Saúde Pública. Barra das Garças, MT, Brasil.
Universidade Federal de Mato Grosso. Laboratório de Entomologia em Saúde Pública. Barra das Garças, MT, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório Nacional e Internacional de Referência em Taxonomia Triatomineos. Rio de Janeiro, RJ, Brasil.
Abstract
Background: Triatomines in Latin America are natural Chagas disease (ChD) vectors. Triatomine domiciliation is one
of the main factors increasing the occurrence risk of this disease in humans. There are 66 triatomine species in Brazil,
with three genera of significant epidemiological importance—Panstrongylus, Rhodnius, and Triatoma. Among the
Triatoma species, Triatoma williami, a wild species, has been reported in Goiás, Mato Grosso, and Mato Grosso do Sul.
In the Barra do Garças, Mato Grosso, the invasion by triatomines has been reported, with T. williami being the most
common species. This study aimed to survey triatomine fauna and determine the Trypanosoma cruzi natural infection
rates in triatomines in the urban area of Barra do Garças, Mato Grosso, Brazil.
Methods: Triatomine specimens were sampled by passive surveillance or active search by agents combating
endemic diseases from 2019 to 2020. A parasitological feces diagnosis was performed to detect the presence of T.
cruzi after the specimens were identified. Concerning T. cruzi identification, molecular diagnosis and genetic sequencing
were performed to determine the strain, also called discrete typing units (DTUs).
Results: The 211 triatomines were collected, distributed in specimens of T. williami (84.4%), P. geniculatus (3.3%), P.
diasi (1.4%), and R. neglectus (10.9%). Two colonies of T. williami were found through morphological analyses. These
insects were sampled inside domiciles in an urban area neighboring Jardim Pitaluga (15° 51′57.7″ N, 052° 16′ 04.5 E).
The records were sampled in September 2019 and January 2021. The rate of natural infection by T. cruzi was 39.4%.
Two T. williami specimens from the sampled colonies were positive for the T. cruzi strain DTU IV.
Conclusions: This is the first time that T. williami has been confirmed in an urban area of Barra do Garças, Mato
Grosso, Brazil. Further studies are needed for a clearer understanding of the ecology of this species for prevention and
control mechanisms since its sampled specimens had a high rate of natural infection by T. cruzi.
Keywords in Portuguese
Trypanosoma cruziTriatomíneos
Colonização
Doença de Chagas
Programa de vigilância
Triatoma williami
Keywords
TriatominaeTriatoma williami
Colonization
Trypanosoma cruzi
Chagas disease
Surveillance program
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