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- W4283794239 abstract "Abstract Background Nchelenge District in northern Zambia suffers from holoendemic malaria transmission despite a decade of yearly indoor residual spraying (IRS) and insecticide-treated net (ITN) distributions. One hypothesis for this lack of impact is that some vectors in the area may forage in the early evening or outdoors. Anopheles gibbinsi specimens were identified in early evening mosquito collections performed in this study area, and further insight was gleaned into this taxon, including characterizing its genetic identity, feeding preferences, and potential role as a malaria vector. Methods Mosquitoes were collected in July and August 2019 by CDC light traps in Nchelenge District in indoor sitting rooms, outdoor gathering spaces, and animal pens from 16:00–22:00. Host detection by PCR, COI and ITS2 PCR, and circumsporozoite (CSP) ELISA were performed on all samples morphologically identified as An. gibbinsi, and a subset of specimens were selected for COI and ITS2 sequencing. To determine risk factors for increased abundance of An. gibbinsi, a negative binomial generalized linear mixed-effects model was performed with household-level variables of interest. Results Comparison of COI and ITS2 An. gibbinsi reference sequences to the NCBI database revealed > 99% identity to “ Anopheles sp. 6” from Kenya. More than 97% of specimens were morphologically and molecularly consistent with An. gibbinsi . Specimens were primarily collected in animal pen traps (59.2%), followed by traps outdoors near where humans gather (24.3%), and traps set indoors (16.5%). Host DNA detection revealed a high propensity for goats, but 5% of specimens with detected host DNA had fed on humans. No specimens were positive for Plasmodium falciparum sporozoites. Animal pens and inland households > 3 km from Lake Mweru were both associated with increased An. gibbinsi abundance. Conclusions This is the first report of An. gibbinsi in Nchelenge District, Zambia. This study provided a species identity for unknown “ An . sp. 6 ” in the NCBI database , which has been implicated in malaria transmission in Kenya. Composite data suggest that this species is largely zoophilic and exophilic, but comes into contact with humans and the malaria parasites they carry. This species should continue to be monitored in Zambia and neighbouring countries as a potential malaria vector." @default.
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- W4283794239 date "2022-07-03" @default.
- W4283794239 modified "2023-10-15" @default.
- W4283794239 title "Expanded geographic distribution and host preference of Anopheles gibbinsi (Anopheles species 6) in northern Zambia" @default.
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- W4283794239 doi "https://doi.org/10.1186/s12936-022-04231-5" @default.
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