Counties in California, New York and Maryland detected their first measles cases of the year. The CDC has warned travelers to be vigilant as spring break begins.

Outbreaks of measles occur as we are a worldwide community. We are easily connected by travel, and other countries do not have the vaccination requirements or compliance rates that we have in the United States. Add an at-risk individual – an unvaccinated child who contracts measles – and you can see how this can easily spread in communities.