Measles immunity among pregnant women aged 15-44 years in Namibia, 2008 and 2010.

•Thirteen percent of pregnant Namibian women are susceptible to measles.•Nearly one in four 15–19-year-old pregnant women are susceptible to measles.•A large measles outbreak did not significantly change the measles population immunity.•In Namibia, measles vaccination should be considered for adults in order to achieve elimination.