Maryland's Mumps Outbreak Centered Near Baltimore

As travelers plan their visits to the Mid-Atlantic region in March 2026, health officials in Maryland report a notable increase in mumps infections this year.

According to the most recent data from the Maryland Department of Health (MDH), as of February 19, 2026, there have been 26 reported cases statewide, including 19 confirmed cases and 7 probable infections.

This marks a significant rise compared to just four confirmed cases throughout all of 2025.

The cases have primarily affected adults in the Baltimore metropolitan area, which includes Baltimore City and surrounding counties such as Anne Arundel, Baltimore, Carroll, Harford, Howard, and Queen Anne's.

Although mumps can occur in any age group across the state, no common link between the cases has been identified to date, despite ongoing investigations by MDH in coordination with local health departments.

MDH officials emphasize that the overall risk to the public remains low. While vaccination status is not specified for most or all cases in the available reports, Maryland's overall high vaccination rates contribute to the low general risk to the public.

This is positive news for the Baltimore Orioles, who are about to open their 2026 season.

Mumps is spread through direct contact with saliva or respiratory droplets from an infected person. It is less contagious than measles, but it can still pose risks, especially in close-contact settings like travel hubs, public transportation, or crowded tourist areas.

Most individuals recover fully from a mumps infection with supportive care, including rest, fluids, and over-the-counter pain relief. However, complications can arise, particularly in adults, says the MDH.

"The most effective prevention against a mumps infection is to get the Measles, Mumps, and Rubella vaccine," stated Dr. Meg Sullivan, Deputy Secretary for Public Health Services at MDH, in a press release.

"Talk with your health care provider about whether you and your family are up to date with the MMR vaccine. It is the most effective way to protect against all three viruses."

For international travelers heading to the greater Baltimore area, or any country reporting mumps outbreaks, Vax-Before-Travel recommends verifying vaccination status with a travel vaccine expert at least 2 weeks before departure.