A person with measles may have exposed other people to the illness at a CVS Pharmacy in Wayne, Pa., as well as at a museum in Philadelphia, according to the Pennsylvania Department of Health.
The possible exposure at CVS happened Dec. 28, while the museum exposure occurred Dec. 29. Infants under a year old, people who were vaccinated from 1963 through 1967 and have not been revaccinated, people born after 1957 who only received one dose of the measles, mumps and rubella vaccine, people who refused the MMR vaccine and those who are from parts of the world with low vaccination coverage are at risk of contracting measles if they had contact with an infected person.
Measles made a comeback in the U.S. in 2014 even though the illness was eliminated in 2000 thanks to the MMR vaccine, according to the Centers for Disease Control and Prevention.
The Pennsylvania Department of Health urged everyone to get vaccinated for measles, and stated the MMR vaccine can even help prevent infection if it's given within three days of exposure. If three days have passed, a dose of immune globulin can provide protection from the illness.