High Parasitic Loads Quantified in Sylvatic Triatoma melanica , a Chagas Disease Vector
is a sylvatic vector species in Brazil. In We aimed to characterize the discrete typing units (DTUs), the parasitic loads, and the blood meal sources of insects collected in rocky outcrops in rural areas in the state of Minas Gerais. An optical microscope (OM) and kDNA-PCR were used to examine natur...
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Veröffentlicht in: | Pathogens (Basel) 2022-12, Vol.11 (12), p.1498 |
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Zusammenfassung: | is a sylvatic vector species in Brazil. In We aimed to characterize the
discrete typing units (DTUs), the parasitic loads, and the blood meal sources of insects collected in rocky outcrops in rural areas in the state of Minas Gerais. An optical microscope (OM) and kDNA-PCR were used to examine natural infection by
, and positive samples were genotyped by conventional multilocus PCR. Quantification of the
load was performed using qPCR, and the blood meal sources were identified by Sanger sequencing the 12S rRNA gene. A total of 141
were captured. Of these, ~55% (61/111) and ~91% (63/69) were positive by OM and KDNA-PCR, respectively. We genotyped ~89% (56/63) of the
-positive triatomines, with TcI (~55%, 31/56) being the most prevalent DTU, followed by TcIII (~20%, 11/56) and TcII (~7%, 4/56). Only TcI+TcIII mixed infections were detected in 10 (~18%) specimens. A wide range of variation in the parasitic loads of
was observed, with an overall median value of 10
parasites/intestine, with females having higher
loads than N2, N4, and N5. TcII showed lower parasitic loads compared to TcI and TcIII. The OM positive diagnosis odds ratio between
infection when the parasite load is 10
compared to 10
was approximately 29.1. The most frequent blood meal source was
(~58%), followed by
(~18%),
(~8%),
(~8%) and
(~8%). Our findings characterize biological and epidemiological aspects of the sylvatic population of
in the study area, highlighting the need to extend surveillance and control to this vector. |
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ISSN: | 2076-0817 2076-0817 |
DOI: | 10.3390/pathogens11121498 |