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High insecticide resistance mediated by different mechanisms in Culex quinquefasciatus populations from the city of Yaoundé, Cameroon
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High insecticide resistance mediated by different mechanisms in Culex quinquefasciatus populations from the city of Yaoundé, Cameroon
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Journal Article
High insecticide resistance mediated by different mechanisms in Culex quinquefasciatus populations from the city of Yaoundé, Cameroon
2021
Overview
Culex
mosquitoes particularly
Culex quinquefasciatus
are important arboviral and filariasis vectors, however despite this important epidemiological role, there is still a paucity of data on their bionomics. The present study was undertaken to assess the insecticide resistance status of
Cx. quinquefasciatus
populations from four districts of Yaoundé (Cameroon). All
Culex quinquefasciatus
populations except one displayed high resistance to bendiocarb and malathion with mortalities ranging from 0 to 89% while high resistance intensity against both permethrin and deltamethrin was recorded. Molecular analyses revealed high frequencies of the
ACE
-1 G119S mutation (ranging from 0 to 33%) and
kdr
L1014F allele (ranging from 55 to 74%) in all
Cx. quinquefasciatus
populations. Significant overexpression was detected for cytochrome P450s genes
CYP6AA7
and
CYP6Z10
, as well as for
Esterase A
and
Esterase B
genes
.
The total cuticular hydrocarbon content, a proxy of cuticular resistance, was significantly increased (compared to the S-lab strain) in one population. The study confirms strong insecticide resistance mediated by different mechanisms in
Cx. quinquefasciatus
populations from the city of Yaoundé. The expansion of insecticide resistance in
Culex
populations could affect the effectiveness of current vector control measures and stress the need for the implementation of integrated vector control strategies in urban settings.
