Survivorship of Anopheles gambiae in relation to malaria transmission in Ilorin, Nigeria

Olayemi, Israel Kayode and Ande, Adeolu Taiwo (2008) Survivorship of Anopheles gambiae in relation to malaria transmission in Ilorin, Nigeria. Online Journal Of Health And Allied Sciences, 7 (3). ISSN 0972-5997

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Abstract

For the first time in Africa, an entomological study went beyond the conventional practice of determining parity and survival rates of field-collected adult anopheline mosquitoes but also related these variables to duration of Plasmodium sporogony and estimated the expectation of infective life. Blood-seeking female mosquitoes were collected in Ilorin, Nigeria, from January 2005 to December 2006, and dissected for ovarian tracheations following WHO recommended techniques. The results indicated an annual mean parous rate of 70.92%, and significantly higher parous rates in the rainy than dry season, which also had very low densities. Mean probability of daily survival of the mosquitoes was 0.80, with annual mean life expectancy of 12.24 days. The probability of surviving the sporogonic cycle was low (< 0.4) but the expectation of infective life was long, especially in the rainy season (mean = 8.31 days). The epidemiological implications of these results were discussed. The An. gambiae population in Ilorin is dominated by older mosquitoes with high survival rates thus, suggesting a high vector potential for the species in the area. These information on the survival rates of An. gambiae in relation to malaria transmission would enhance the development of a more focused and informed vector control interventions

EPrint Type:Article
Uncontrolled Keywords:Infection, Life expectancy, Mosquitoes, Parity, Plasmodium, Sporogonic Cycle, Anopheles gambiae, Transmission, Malaria, Nigeria
Subjects:Pathological Conditions, Signs and Symptoms > Pathologic Processes > Disease Attributes
Parasitic Diseases > Protozoan Infections
Animals > Invertebrates
-Journal Repositories > Online Journal of Health and Allied Sciences
Genetic Processes > Mutagenesis
Parasitic Diseases > Protozoan Infections > Coccidiosis > Malaria
Geographic Locations > Africa > Africa South of the Sahara > Africa, Western > Nigeria
ID Code:3182
Deposited By:Dr Srinivas Kakkilaya
Deposited On:17 December 2008

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