Seroprevalence of Dengue and Chikungunya Virus Antibodies, French Polynesia, 2014–2015

We investigated dengue and chikungunya virus antibody seroprevalence in French Polynesia during 2014–2015. Dengue virus seroprevalence was ≈60% among schoolchildren and >83% among the general population; chikungunya virus seroprevalence was <3% before and 76% after Zika virus emergence (2013). Dengue virus herd immunity may affect Zika virus infection and pathogenesis.