Measles transmission among adults with spread to children during an outbreak: Implications for measles elimination in China, 2014.

•There are few studies that describe adult measles outbreaks in community settings.•Virus transmission was initially from adult-to-adult, followed by adult-to-child.•Adult susceptibility to measles is a potential threat to measles elimination in China.•The importance of targeting susceptible adults during outbreak response immunization is highlighted.