Maryland Reports 26 Mumps Cases in 2026, Mostly Baltimore Adults

The Maryland Department of Health issued a notice on Feb. 19, 2026 reporting a rise to 26 mumps cases in 2026, comprised of 19 confirmed infections and seven probable cases, with most patients identified as adults in the Baltimore metropolitan area. The update marks the state's current tally for the year and focuses attention on urban adult populations in and around Baltimore City.

MDH's Feb. 19 update did not list a detailed breakdown by neighborhood, but the agency specified that the majority of infections are concentrated among adults in the Baltimore metropolitan area. That concentration is notable because 19 confirmed cases already meet the state's threshold for heightened surveillance, while the seven probable cases place total reported illness at 26 for the year so far.

Public health officials in Baltimore City and surrounding counties will be watching the trend tracked by MDH on Feb. 19, 2026 as they consider responses targeted to adult populations. The MDH notice makes clear that the state's mumps activity in 2026 is centered in the Baltimore metro region, which has implications for workplaces, community organizations, and congregate settings that serve adults across Baltimore City and nearby jurisdictions.

State-level reporting from the Feb. 19 MDH notice establishes the baseline that local health departments will use to assess testing, case investigation, and resource allocation for the remainder of 2026. With 19 confirmed and seven probable cases identified in the Maryland Department of Health update, Baltimore-area public health officials will need to track whether cases spread beyond the adult population noted in the Feb. 19 report.

The Maryland Department of Health's Feb. 19, 2026 notice provides the current official count of 26 mumps cases this year, and it positions the Baltimore metropolitan area as the primary focus for ongoing surveillance and response. Local leaders and health agencies now hold the responsibility of translating the state's Feb. 19 figures into targeted outreach and monitoring for Baltimore City adults as the situation develops.