North Dakota Health and Human Services (HHS) is reporting one confirmed measles case in Cass County. This is the first case reported in Cass County in 2026.
The individual likely acquired the infection within the state. HHS is continuing its investigation to determine the source of exposure, as the individual reported no recent out-of-state or international travel.
North Dakota has had a total of 38 confirmed cases of measles this year through May 15, and five individuals have been hospitalized. This compares to 36 measles cases in the state in 2025, which resulted in three hospitalizations. The United States has confirmed 1,842 cases in 2026.
Who is at risk?
Measles is a highly contagious viral illness that can be serious, particularly for young children and individuals with compromised immune systems. Individuals who are unvaccinated are most at risk. These individuals are encouraged to talk to a trusted healthcare provider about vaccination.
Measles spreads easily through the air and can remain in a room and on surfaces for up to two hours after a person who is contagious leaves that space. Individuals with measles are contagious for several days before and after symptoms appear. Symptoms often include fever, cough, runny nose and eye irritation followed by a widespread rash.
Those who think they have measles should call first before seeking healthcare to avoid exposing others to measles. HHS recommends individuals who are not vaccinated and are exposed to measles stay home and avoid public settings for 21 days after exposure. Unvaccinated individuals who are exposed to measles should talk to their healthcare provider about options to reduce the risk of illness or severe outcomes.
Measles vaccine recommendations
The MMR vaccine remains the most effective way to prevent measles. One dose of MMR vaccine is about 93% effective at preventing measles; two doses are about 97% effective.
MMR is recommended starting at 12-15 months of age with a second dose at 4-6 years of age. Children who have already received two post-12-month doses of MMR are considered fully vaccinated. Families are encouraged to stay on schedule with routine childhood immunizations to ensure the best protection against measles and other vaccine-preventable diseases.
Infants ages 6-11 months who are traveling internationally or to outbreak areas within the United States are recommended to receive one early dose of MMR vaccine before travel. Early and accelerated vaccination continues to be recommended for Grand Forks County. The Ransom County outbreak was declared over on May 13.
Children who receive an early dose before 12 months of age will still need the routine two-dose series after their first birthday. Individuals planning international travel are encouraged to talk with their healthcare provider to ensure they are adequately protected against measles before departure.
Adults born before 1957 are generally presumed immune due to a history of measles illness. Adults born in 1957 or later should ensure they have received at least one documented dose of MMR.
MMR vaccines are available through most clinics. For families in need, the federally funded Vaccines for Children (VFC) Program provides vaccines at no cost through participating providers.
Individuals unsure of their vaccination status are encouraged to consult their healthcare provider. Immunization records can be reviewed at hhs.nd.gov/IRR or by contacting a provider.
For more information about measles or immunizations, contact the HHS Immunization Unit at 701.328.2378, 711 (TTY) or visit hhs.nd.gov/measles.