Maryland Measles Outbreak: Cases Triple Before School
UPDATE: August 28, 2026
This article was originally published July 17, 2026, when Maryland had confirmed 9 measles cases. The situation has changed substantially. The update below reflects current case counts and the formal outbreak declaration issued by MDH on August 25, 2026.
Maryland is now in an active measles outbreak.
The Maryland Department of Health has confirmed 31 cases statewide in 2026, with 27 of those cases reported since July 15. All 27 cases identified since mid-July have been in unvaccinated residents, concentrated in St. Mary's (13), Carroll (8), Cecil (5), and Charles (1) counties.
On August 24, MDH formally declared measles outbreaks in Carroll, Cecil, and St. Mary's counties. This is no longer a travel-linked cluster situation. While MDH states there is currently no evidence of widespread community transmission, active household spread is occurring in under-vaccinated communities.
The urgency intensified this week when Pennsylvania confirmed two measles-associated deaths in Lancaster County, which shares a border with Cecil County. These are the first measles deaths in the mid-Atlantic region during this outbreak period.
Public health analysts point to declining vaccination coverage in the outbreak counties as a key driver. In Cecil County, approximately 3.6% of kindergartners hold religious exemptions from vaccine requirements, up from 2.84% the prior year. In Carroll County, roughly 2.6% of kindergartners are exempt, per reporting from Maryland Matters.
Nationally, the picture is equally sobering. As of August 20, 2,777 confirmed measles cases have been reported across 47 jurisdictions in 2026, with 36 active outbreaks and 94% of cases linked to outbreak clusters. Vaccination coverage among U.S. kindergartners has dropped from 95.2% in the 2019-2020 school year to 92.4% in 2025-2026, leaving an estimated 280,000 kindergartners unprotected.
What This Means for Your Montgomery County Practice
No cases have been confirmed in Montgomery County. But the outbreak counties are within driving distance, and Montgomery County physicians should expect to see patients who have recently visited Carroll, Cecil, or St. Mary's counties for work, family, recreation, or religious gatherings. Some patients may not connect a recent trip with a potential exposure, so the burden falls on you to ask.
Build exposure screening into your intake process now. For any patient presenting with fever, cough, coryza, or conjunctivitis, ask directly: Have you or anyone in your household spent time in Carroll, Cecil, St. Mary's, or Charles counties in the past three weeks? Have you attended any large gatherings or religious events in those areas? If the answer is yes and the patient is unvaccinated or has unknown vaccine status, isolate before they enter your waiting room and notify MDH before the patient leaves your office.
Every patient encounter right now is an opportunity to verify MMR status, with children and adults born after 1957 as your first priority. If a patient is unvaccinated or behind on doses, vaccinate now. Montgomery County's vaccination rates are strong overall, but pockets of under-vaccination exist, and it only takes one exposure to bring the virus into a practice.
If a patient's unvaccinated child attends school with children from the affected counties, or if your patient works in one of those areas, they may have had contact without knowing it. Two doses of MMR confer 97% protection against measles. For patients who are uninsured or underinsured, the MMR vaccine is available through the Vaccines for Children Program. Adults can inquire about access through the Montgomery County Department of Health and Human Services.
For real-time updates, monitor the Maryland Department of Health measles page and the Johns Hopkins Bloomberg School of Public Health measles tracker. Suspected cases must be reported to MDH immediately, before the patient leaves your office.