2.10.26 MDH Clinician Letter: Increase in Mumps Cases
February 11, 2026
The Maryland Department of Health (MDH) has noted a recent increase in mumps cases. Specifically, there have been 14 cases reported in Maryland (10 confirmed and 4 probable) in 2026, compared to 4 cases (1 confirmed and 3 probable) in all of 2025. These recent cases have primarily been occurring in adults in the Baltimore metropolitan area, although mumps cases can occur in any age group and throughout the state.
We would like to make you aware of this increase so that you can take appropriate steps to identify suspected cases in a timely manner, ensure appropriate testing and public health reporting is completed, and continue to offer vaccination for patients as per current clinical recommendations.
Please review and share the linked MDH Clinician Letter with your clinical teams: https://www.mbp.state.md.us/forms/02.10.26_Clinician%20Letter_Mumps_Increase.pdf
As always, please let us know if you have any questions, and immediately report suspect cases to your local health department. Remember that Mumps PCR testing at the state laboratory requires prior approval.