Aggressive mosquito fauna and malaria transmission in a forest area targeted for the creation of an agro-industrial complex in the south of Cameroon

  • P. Ntonga Akono | patakono2000@yahoo.fr Laboratory of Animal Biology, Department of Animal Biology, Faculty of Science, University of Douala, Cameroon.
  • C. Tonga Laboratory of Animal Biology, Department of Animal Biology, Faculty of Science, University of Douala, Cameroon.
  • O.E. Ngo Hondt Laboratory of Animal Biology, Department of Animal Biology, Faculty of Science, University of Douala, Cameroon.
  • M.F. Peka Nsangou Laboratory of Zoology, Department of Biology and Animal Physiology, University of Yaoundé I, Yaoundé, Cameroon.
  • R. Ngaha Laboratory of Animal Biology, Department of Animal Biology, Faculty of Science, University of Douala, Cameroon.
  • G. Tamdem Magne Laboratory of Animal Biology, Department of Animal Biology, Faculty of Science, University of Douala, Cameroon.
  • L. Youmbi Enga Laboratory of Animal Biology, Department of Animal Biology, Faculty of Science, University of Douala, Cameroon.
  • A. Yomon Kayoum Laboratory of Animal Biology, Department of Animal Biology, Faculty of Science, University of Douala, Cameroon.
  • P. Nkouandou Mache Laboratory of Animal Biology, Department of Animal Biology, Faculty of Science, University of Douala, Cameroon.
  • L.A. Djomi Laboratory of Zoology, Department of Biology and Animal Physiology, University of Yaoundé I, Yaoundé, Cameroon.
  • F.A. Mbouangouro Laboratory of Zoology, Department of Biology and Animal Physiology, University of Yaoundé I, Yaoundé, Cameroon.
  • L.G. Lehman Laboratory of Animal Biology, Department of Animal Biology, Faculty of Science, University of Douala, Cameroon.

Abstract

Baseline entomological information should be collected before the implementation of industrial projects in malaria endemic areas. This allows for subsequent monitoring and evaluation of the project impact on malaria vectors. This study aimed at assessing the vectorial system and malaria transmission in two ecologically different villages of the South-Cameroon forest bloc targeted for the creation of an agro-industrial complex. For four consecutive seasons in 2013, adult mosquitoes were captured using Human Landing Catch in NDELLE village (located along a main road in a degraded forest with many fish ponds) and KOMBO village (located 5km far from the main road in a darker forest and crossed by the Mvobo River). Morpho-taxonomic techniques were used alongside molecular techniques for the identification of mosquito species. ELISA test was used for the detection of circumsporozoite protein antigen of Plasmodium falciparum. Mosquito biting rate was higher in NDELLE than in KOMBO (28.18 versus 17.34 bites per person per night). Mosquitoes had a strong tendency to endophagy both in NDELLE (73.57%) and KOMBO (70.21%). Three anophelines species were identified; An. gambiae, An. funestus s.s and An. moucheti s.s.. An. gambiae and An. funestus s.s. represented the bulk of aggressive mosquitoes in NDELLE (n=10,891; 96.62%). An. gambiae was responsible for 62.6% and 77.72% of malaria transmission in KOMBO and NDELLE respectively. Mean entomological inoculation rate recorded in KOMBO and NDELLE were 4.82 and 2.02 infective bites per person per night respectively. Vector control was mainly based on the use of long-lasting insecticidal nets and indoor residual spraying. The degraded forest environment added to the presence of fishponds resulted in the increase of aggressive mosquito density but not of malaria transmission. The managers should use these data for monitoring and evaluation of the impact of their project; malaria control strategies should be included in their project in order to mitigate the risk of increased malaria transmission as a result of the implementation of their projects.

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Published
2016-12-19
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Articles
Keywords:
Malaria transmission, Anopheles, degraded forest, non-degraded forest, fish ponds, South-Cameroon.
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How to Cite
Ntonga Akono, P., Tonga, C., Ngo Hondt, O., Peka Nsangou, M., Ngaha, R., Tamdem Magne, G., Youmbi Enga, L., Yomon Kayoum, A., Nkouandou Mache, P., Djomi, L., Mbouangouro, F., & Lehman, L. (2016). Aggressive mosquito fauna and malaria transmission in a forest area targeted for the creation of an agro-industrial complex in the south of Cameroon. Journal of Entomological and Acarological Research, 48(3), 380-387. https://doi.org/10.4081/jear.2016.5930