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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.

High mosquito burden and malaria transmission in a district of the city of Douala, Cameroon