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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
High mosquito burden and malaria transmission in a district of the city of Douala, Cameroon
BMC Infectious Diseases, Volume 12, Article 275, Year 2012
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Description
Background: Rapid demographic growth in Douala city, Cameroon, has resulted in profound ecological and environmental changes. Although demographic changes can affect anopheline mosquito breeding sites, there is a lack of understanding about the epidemiological impact that such changes might have on vector ecology and malaria transmission.Methods: A 12-month entomological study was conducted in a highly populated district of Douala called Ndogpassi. Adult mosquitoes were collected using two methods: 1) human landing catches (HLC); and 2) Centers for Disease Control and Prevention (CDC) light traps; these methods were used twice monthly from January to December 2011. Mosquito genus and species were identified with morphological and molecular diagnostic tools. The sampling efficiency of the CDC light trap and HLC were compared. Anopheles gambiae infection with Plasmodium falciparum was detected using ELISA. Susceptibility to DDT, permethrin, and deltamethrin insecticides were also determined.Results: A total of 6923 mosquitoes were collected by HLC (5198) and CDC light traps (1725). There was no equivalence in the sampling efficiency between light traps and human landing catches (P > 0.01). With 51% of the total, Culex was the most common, followed by Anopheles (26.14%), Mansonia (22.7%) and Aedes (0.1%). An. gambiae ss (M form) comprised ~98% of the total anophelines collected. An. gambiae had a biting rate of 0.25 to 49.25 bites per human per night, and was the only species found to be infected with P. falciparum. A P. falciparum infection rate of 0.5% was calculated (based on enzyme-linked immunosorbent assays using the circumsporozoite surface protein). The entomological inoculation rate was estimated at 31 infective bites per annum. Insecticide susceptibility tests on An. gambiae females revealed a mortality rate of 33%, 76% and 98% for DDT, permethrin and deltamethrin, respectively. The West African kdr allele (L1014F) was detected in 38 of the 61 An. gambiae analyzed (62.3%).Conclusions: The present study revealed seasonal malaria transmission in Douala. High levels of An. gambiae were detected along with a high prevalence of insecticide resistance in this vector population. These findings highlight the need to promote use of insecticide-impregnated bed nets in Douala. © 2012 Antonio-Nkondjio et al.; licensee BioMed Central Ltd.
Authors & Co-Authors
Antonio-Nkondjio, Christophe
Cameroon, Yaounde
Laboratoire de Recherche Sur le Paludisme Yaounde
United Kingdom, Liverpool
Liverpool School of Tropical Medicine
Cameroon, Bamenda
University of Bamenda
Defo-Talom, Blaise Armand
Cameroon, Yaounde
Laboratoire de Recherche Sur le Paludisme Yaounde
Cameroon, Dschang
University of Dschang
Tagne-Fotso, Romuald
Cameroon, Douala
University of Douala
Téné-Fossog, Billy
Cameroon, Yaounde
Laboratoire de Recherche Sur le Paludisme Yaounde
Cameroon, Yaounde
Université de Yaoundé I
Ndo, Cyrille
Cameroon, Yaounde
Laboratoire de Recherche Sur le Paludisme Yaounde
Cameroon, Douala
University of Douala
Lehman, Léopold Gustave
Cameroon, Douala
University of Douala
Tchuinkam, Timoléon
Cameroon, Yaounde
Laboratoire de Recherche Sur le Paludisme Yaounde
Cameroon, Dschang
University of Dschang
Kengne, Pierre
Cameroon, Yaounde
Laboratoire de Recherche Sur le Paludisme Yaounde
France, Montpellier
Maladies Infectieuses et Vecteurs : Écologie, Génétique, Évolution et Contrôle
Awono-Ambéné, Parfait Herman
Cameroon, Yaounde
Laboratoire de Recherche Sur le Paludisme Yaounde
Statistics
Citations: 60
Authors: 9
Affiliations: 7
Identifiers
Doi:
10.1186/1471-2334-12-275
e-ISSN:
14712334
Research Areas
Genetics And Genomics
Infectious Diseases
Study Design
Cross Sectional Study
Study Locations
Cameroon
Participants Gender
Female