Sacramento health officials sounded the alarm about a potential measles outbreak on Monday after more than 100 children were exposed to an unvaccinated child at an educational enrichment program. It’s far from the only community at risk. The US has already passed 1,000 confirmed cases this year, with infections “worse than expected” in Utah and the largest outbreak on an American college campus in recent history occurring at Ave Maria University in Florida. While about one in five unvaccinated