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Home sweet home: sand flies find a refuge in remote indigenous villages in north-eastern Brazil, where leishmaniasis is endemic. | LitMetric

AI Article Synopsis

Article Abstract

Background: From 2012 to 2013, an outbreak of cutaneous leishmaniasis by Leishmania braziliensis was detected in indigenous villages located in a remote rural area of Pernambuco state, north-eastern Brazil. Considering that the principal activities of this indigenous community are farming and crop plantation, and also that the outbreak involved many children, we investigated the presence of sand fly vectors inside human houses and also the exposure of dogs to leishmanial parasites. Our general objective was to gather epidemiological data that could indicate the occurrence of a peri-domestic/domestic transmission cycle of L. braziliensis in these indigenous villages.

Methods: From March 2015 to March 2016, sand flies were collected using light traps in the indoor and immediate outdoor environments in the three indigenous villages that reported the most cutaneous leishmaniasis cases during the 2012-2013 outbreak. Moreover, samples obtained from 300 dogs living in the outbreak villages and two nearby villages were tested by a rapid immunochromatographic test and by a real-time PCR for detecting anti-Leishmania antibodies and Leishmania DNA, respectively.

Results: In total, 5640 sand flies belonging to 11 species were identified. Males (n = 3540) predominated over females (n = 2100). Migonemyia migonei (84.3%) was the most abundant species, followed by Evandromyia lenti (5.5%), Lutzomyia longipalpis (4.1%), Nyssomyia intermedia (1.6%) and Micropygomyia capixaba (1.4%), representing together ~97% of the sand flies collected. Nine out of the 11 species identified in this study were found indoors, including M. migonei, L. longipalpis and N. intermedia, which are proven vectors of Leishmania spp. Out of 300 dogs tested, 26 (8.7%) presented anti-Leishmania antibodies and six (2%) were Leishmania DNA-positive. The level of exposure in dogs living in the indigenous villages where the 2012-2013 outbreak of human CL was detected was almost 2-fold higher than in the two nearby villages (11.0 vs 6.2% for serology and 2.6 vs 1.4% for real-time PCR).

Conclusions: The results suggest that different sand fly vectors may be adapted to human dwellings, thus increasing the risk of transmission in the indoor and immediate outdoor environments. The adaptation of sand flies to the indoor environment in the studied indigenous villages may be partly explained by the poor housing conditions and the proximity of the houses to crop plantations and forest fragments.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6434633PMC
http://dx.doi.org/10.1186/s13071-019-3383-1DOI Listing

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