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Yellow fever in gambia 1978 1979 a complementary entomological survey done in october 1979



Yellow fever in gambia 1978 1979 a complementary entomological survey done in october 1979



Cahiers O R S T O M (Office de la Recherche Scientifique et Technique Outre-Mer) Serie Entomologie Medicale et Parasitologie 18(1): 3-12



A survey was conducted in Gambia in Oct. 1979 to show which were the prevailing vectors during the peak of the 1978 yellow fever outbreak, i.e., at the end of the rainy season. Feral vectors, chiefly the Aedes furcifer-taylori group, were involved in a sylvatic process, including monkey to man transmission. A. aegypti larvae were found everywhere in domestic or peridomestic situations but in the eastern part of the country, a discrepancy frequently appeared between rather high larval breeding indices and a low adult biting activity. In some places, this species was anthropophilic enough to have been involved in a man to man transmission of the yellow fever virus. Following this mixed epidemiological pattern, which probably prevailed from June to the end of Nov., a 2nd period occurred during which the transmission became strictly of a man to man type with A. aegypti as only vector. Two strains of yellow fever virus were isolated from pools of females of this species caught in western Gambia in Jan. 1979.

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