An unvaccinated child returned home from international travel and showed measles symptoms. Their case is consistent with a national trend, officials say.

The child was unvaccinated and recently returned from international travel, according to the Sacramento County public health ...

Measles is the most contagious disease that we know. It spreads with unbelievable efficiency, in a nonimmune or a partially immune population,” says Dr. Adam Ratner, pediatric infectious disease ...