Chikungunya virus infection during pregnancy, Reunion, France, 2006.

Mother-to-child transmission of chikungunya virus was reported during the 2005-2006 outbreak on Reunion Island, France. To determine the effects of this virus on pregnancy outcomes, we conducted a study of pregnant women in Reunion in 2006. The study population was composed of 1,400 pregnant women (628 uninfected, 658 infected during pregnancy, 27 infected before pregnancy, and 87 infected on unknown dates).