Despite having a very effective and easily available vaccine, measles outbreaks have continued to pop up in the United States over the last two decades.
Most recently, there have been eight cases confirmed in Philadelphia since December 2023, all among unvaccinated individuals. Additionally, a person with measles traveled through D.C.-area airports and cases have been identified in Delaware, New Jersey and Washington state, according to local reports.
In 2023, there were 41 confirmed cases of measles, according to incomplete data from the Centers for Disease Control and Prevention (CDC).