Cited by 35Malaria Research and ControlMosquito-borne diseases and controlDengue and Mosquito Control Research

Spatial distribution of Anopheles gambiae sensu lato larvae in the urban environment of Yaoundé, Cameroon

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Djamouko-Djonkam, Landre, Mounchili-Ndam, Souleman, Kala-Chouakeu, Nelly, Nana-Ndjangwo, Stella Mariette, Kopya, Edmond, Sonhafouo-Chiana, Nadége, Talipouo, Abdou, Ngadjeu, Carmene Sandra +6 more·2019·Infectious Diseases of Poverty

Abstract

Background: The rapid and unplanned urbanization of African cities is considered to increase the risk of urban malaria transmission. The present study objective was to assess factors influencing the spatio-temporal distribution of Anopheles gambiae s.l. larvae in the city of Yaoundé, Cameroon. Methods: All water bodies were checked once every 2 months for the presence of mosquito larvae from March 2017 to May 2018 in 32 districts of Yaoundé. Physico-chemical characteristics including the size, depth, turbidity, pH, temperature, conductivity, sulfates, organophosphates, hydrogen peroxide (H 2 O 2), conductivity, iron and calcium were recorded and analyzed according to anopheline larvae presence or absence. High resolution satellite images from landsat sentinel Enhanced Thematic Mapper were used for spatial mapping of both field and environmental variables. Bivariate and multivariate logistic regression models were used to identify variables closely associated with anopheline larvae distribution. Results: A total of 18 696 aquatic habitats were checked and only 2942 sites (15.7%) contained anopheline larvae. A high number of sites with anopheline larvae (≥ 69%) presented late instar larvae (L3, L4 and pupae). Anopheline mosquito larvae were sampled from a variety of breeding sites including puddles (51.6%), tire prints (12.9%), wells (11.7%) and drains (11.3%). Bivariate logistic regression analyses associated anopheline larvae presence with the absence of predators, absence of algae, absence of vegetation and depth of less than 1 m. Conductivity, turbidity, organophosphates, H 2 O 2 and temperature were significantly high in breeding sites with anopheline larvae than in breeding sites without these larvae (P < 0.1). Anopheline species collected included An. coluzzii (91.1%) and An. gambiae s.s. (8.9%). GIS mapping indicated a heterogeneous distribution of anopheline breeding habitats in the city of Yaoundé. Land cover analysis indicated high variability of the city of Yaoundé’s landscape. Conclusions: The data confirms adaptation of An. gambiae s.l. to the urban domain in the city of Yaoundé and calls for urgent actions to improve malaria vector control.

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Authors
Djamouko-Djonkam, L., Mounchili-Ndam, S., Kala-Chouakeu, N., Nana-Ndjangwo, S. M., Kopya, E., Sonhafouo-Chiana, N., Talipouo, A., Ngadjeu, C. S., Doumbe-Belisse, P., Bamou, R., Toto, J. C., Tchuinkam, T., Wondji, C. S., & Antonio-Nkondjio, C.
Affiliations
  • Université de Dschang (CM)
  • Université de Yaoundé I (CM)
  • Organisation de Coordination pour la lutte contre les Endémies en Afrique Centrale (CM)
  • Liverpool School of Tropical Medicine (GB)
Venue
Infectious Diseases of Poverty
Published
2019-10-09
Volume
8
Issue
1
Pages
84-84
ISSN
2049-9957 (ISSN-L)
OpenAlex
W2979422482
Cited by
35
References
8
Citations by year
2025: 1 · 2024: 6 · 2023: 6 · 2022: 7 · 2021: 10 · 2020: 5
FWCI
5.07
Type
journal article
Language
en
Open access
Locations
  • Infectious Diseases of Poverty (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • LSTM Online Archive (Liverpool School of Tropical Medicine) (acceptedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Wellcome Trust (202687/Z/16/Z)
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Malaria Research and Control
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Mosquito-borne diseases and control
  • Social Sciences › Sociology and Political Science › Dengue and Mosquito Control Research
Keywords
Anopheles gambiae s.l., mosquito larvae, urban malaria, mosquito breeding sites, Anopheles coluzzii, Anopheles gambiae s.s., water physicochemical parameters, urbanization, Yaoundé, malaria vector control, spatiotemporal variation
MeSH terms
Animals, Anopheles, Cameroon, Cities, Environment, Larva, Pupa, Spatio-Temporal Analysis, Animal Distribution

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