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Yellow fever in Africa and South America, 2013.

Surveillance YF case-based surveillance is regularly conducted in 27 of 34 YF endemic countries. Routine YF surveillance results in the notification of suspected cases; a collection of specimens is then submitted to national laboratories for screening serological testing. In 2015, the case-based surveillance identified 7299 suspected YF cases. Of these, 6342 specimens had blood specimen tested in national laboratories; 130 were IgM-ELISA positive. After confirmatory testing, 53 laboratory-positive cases were identified from 6 countries: Cameroon (33), Côte d’Ivoire (13), Gabon (1), Mali (3), Senegal (1) and Togo (2). However, detailed vaccination history of these cases could not be obtained.