SURVEILLANCE FOR YELLOW-FEVER VIRUS IN EASTERN SENEGAL DURING 1993

During the 1993 rainy season, 15,806 mosquitoes, including 14,304 Aede s ssp., were collected and tested for virus infection in 702 and 547 p ools, respectively. Aedes furcifer (Edwards) was the most abundant spe cies collected througout the survey period. Yellow fever (YF) virus wa s detected in 187 pools: Ae. furcifer (123 isolates), Ae. taylori (Edw ards) (41 isolates), and Ac, luteocephalus (Newstead) (23 isolates). A high prevalence of immunoglobulin (IgG) antibodies was found in human and simian populations. Results clearly indicated that increased sylv atic YF activity in eastern Senegal has the increased the risk of YF t ransmission among rural populations in West Africa. Our results showed that a minimal survey period may be effective in detecting the circul ation of YF in the Kedougou area.