Aedes albopictus introduction into continental Africa, 1991

From April 15 through July 20, 1991, an epidemic of yellow fever (YF) occurred in Delta State, Nigeria. In September 1991, as part of a follow-up investigation, mosquito oviposition cups were deployed in four rural communities with YF, all within a 24-kilometer radius of the principal town of Agbor. Based on findings from the follow-up investigation, this report documents the first record of breeding populations of Ae. albopictus--a competent YF virus vector--in continental Africa.