Conference abstract
Competitive adaptation of Aedes albopictus, Skuse 1894 in the presence of Aedes aegypti Linné 1862 in larvae breeding sites in Douala (Cameroon)
Pan African Medical Journal - Conference Proceedings. 2023:18(83).03
Oct 2023.
doi: 10.11604/pamj-cp.2023.18.83.2037
Archived on: 03 Oct 2023
Contact the corresponding author
Keywords: Aedes albopictus, Aedes aegypti, larval sympatry
Poster
Competitive adaptation of Aedes albopictus, Skuse 1894 in the presence of Aedes aegypti Linné 1862 in larvae breeding sites in Douala (Cameroon)
Ngo Hondt Odette Etoile1,&, Akono Ntonga Patrick1, Ngo Hiol1, Diane Nko Edou1, Calvin Tonga1, Giséle Aurélie Foko Dadji1, Sivelor Kekeunou1
1University of Douala, Douala, Cameroon
&Corresponding author
Introduction: Aedes albopictus and Aedes aegypti are two potential vectors of arboviruses in Douala. Knowing their breeding behaviour and insecticide resistance status would allow for better design of control activities. The objective was to contribute to the knowledge of A. aegypti and A. albopictus larva breeding sites, and their resistance status to insecticides in three neighbourhoods of Douala.
Methods: mosquito larvae and nymphs were captured from breeding sites from July to September 2017, in Ndogbong, PK21 and Yassa, three neighbourhoods of the city of Douala, with ecological peculiarities. They were reared as adults and then identified as species. Female mosquitoes aged 3 to 5 days, not fed on blood, were tested for pyrethroid sensibility.
Results: overall, 144 breeding artificial and natural sites were identified in the 3 neighbourhoods. A. albopictus was the single species found in most of the breeding sites (64.6%), whereas A. aegypti was found only in 4 sites (2.8%). Both species lived sympatrically in 47 sites (32.6%). Morphological identification of 8,160 adults revealed a significantly higher abundance of A. albopictus compared with A. aegypti (88.8% versus 11.2%). Insecticide resistance test with deltamethrin and permethrin revealed resistance in female A. aegypti and A. albopictus from Ndogbong and Yassa (mortality rates < 92%)
Conclusion: A. albopictus shows better adaptation to artificial breeding sites in Douala and their resistance to recommended insecticides calls for new insecticidal molecules.
Competitive adaptation of Aedes albopictus, Skuse 1894 in the presence of Aedes aegypti Linné 1862 in larvae breeding sites in Douala (Cameroon)
Ngo Hondt Odette Etoile1,&, Akono Ntonga Patrick1, Ngo Hiol1, Diane Nko Edou1, Calvin Tonga1, Giséle Aurélie Foko Dadji1, Sivelor Kekeunou1
1University of Douala, Douala, Cameroon
&Corresponding author
Introduction: Aedes albopictus and Aedes aegypti are two potential vectors of arboviruses in Douala. Knowing their breeding behaviour and insecticide resistance status would allow for better design of control activities. The objective was to contribute to the knowledge of A. aegypti and A. albopictus larva breeding sites, and their resistance status to insecticides in three neighbourhoods of Douala.
Methods: mosquito larvae and nymphs were captured from breeding sites from July to September 2017, in Ndogbong, PK21 and Yassa, three neighbourhoods of the city of Douala, with ecological peculiarities. They were reared as adults and then identified as species. Female mosquitoes aged 3 to 5 days, not fed on blood, were tested for pyrethroid sensibility.
Results: overall, 144 breeding artificial and natural sites were identified in the 3 neighbourhoods. A. albopictus was the single species found in most of the breeding sites (64.6%), whereas A. aegypti was found only in 4 sites (2.8%). Both species lived sympatrically in 47 sites (32.6%). Morphological identification of 8,160 adults revealed a significantly higher abundance of A. albopictus compared with A. aegypti (88.8% versus 11.2%). Insecticide resistance test with deltamethrin and permethrin revealed resistance in female A. aegypti and A. albopictus from Ndogbong and Yassa (mortality rates < 92%)
Conclusion: A. albopictus shows better adaptation to artificial breeding sites in Douala and their resistance to recommended insecticides calls for new insecticidal molecules.
