US Measles Cases Hit 5,182 as Wisconsin Reports Infant Death

Key takeaways

• The CDC counted 5,182 confirmed US measles cases as of November 5, 2026—more than twice the full-year 2025 total.

• The CDC linked 96% of confirmed cases to outbreaks. Reuters and CIDRAP reported that 96% of patients were unvaccinated or had an unknown vaccination status.

• Check vaccination records and follow local health department notices. Wisconsin has reported an infant death and a separate possible exposure at a hospital emergency department.

The CDC's November 6 update counted 5,182 confirmed measles cases in the United States as of November 5, 2026, more than double the 2,289 cases reported for all of 2025. The update comes as Wisconsin reports an infant death connected to its outbreak and health departments continue investigating new exposures.

What happened in the latest measles update?

The CDC updated its national case page on November 6. It counted 5,182 confirmed cases for 2026: 5,164 reported by 47 US jurisdictions and 18 among international visitors. The agency also counted 43 outbreaks, with 4,993 cases—96% of the national total—linked to outbreaks. See the CDC's November 6 case update.

The number is already more than twice the 2,289 confirmed cases recorded during the whole of 2025. The CDC's total includes confirmed cases reported to the agency by noon on Thursday, November 5; it does not include probable cases that jurisdictions have not confirmed. The CDC says state health departments may have more up-to-date local figures.

The outbreak is not limited to young children. Reuters reported that 562 people, or 11% of confirmed cases, had been hospitalized. People aged 20 and older accounted for 2,132 cases, while 2,104 cases were among people aged 5 to 19 and 908 were among children younger than 5. The University of Minnesota's CIDRAP report said children and teenagers made up 59% of cases. Both Reuters and CIDRAP reported that 96% of patients were unvaccinated or had an unknown vaccination status. Read Reuters' November 6 report.

Wisconsin added two developments. On November 5, the state Department of Health Services reported that an infant had died from measles in the southwestern part of the state. The department said it was the first such death reported in Wisconsin since 1990 and withheld further personal details to protect the family. As of November 6, Wisconsin had reported 477 cases, nine hospitalizations and one death.

The state also posted a separate possible exposure notice for Marshfield Medical Center–Weston's emergency department in Weston, Wisconsin. A person with confirmed measles was at the emergency department on November 5 between 1:30 p.m. and 3:30 p.m. The Wisconsin DHS notice says health officials are working to identify and notify people who may have been exposed.

Why do the numbers matter?

Analysis: The United States declared measles eliminated in 2000, meaning sustained transmission had been interrupted. The current outbreak total, together with repeated local outbreaks, shows why that status depends on keeping vaccination coverage high and containing imported infections quickly.

The CDC says kindergarten MMR vaccination coverage fell from 95.2% in the 2019–2020 school year to 92.4% in 2025–2026. It estimates that about 280,000 kindergartners were at risk during the latest school year. The agency says community protection is strongest when more than 95% of people are vaccinated, although coverage can be much lower in particular communities even when a state's average is high.

The gap matters because measles spreads through the air and is highly contagious. An infected person can expose people who share an indoor space, including babies who are too young for their routine first dose, people with certain immune conditions and others who cannot rely on vaccination.

The figures also need careful reading. The CDC says 96% of cases were linked to outbreaks; that is different from the separate finding that 96% of patients were unvaccinated or had unknown vaccination status. One describes how infections are connected, while the other describes the patients' recorded vaccination status.

What should families and exposed residents do now?

• Check vaccination records. The CDC recommends two MMR doses for children, normally at 12–15 months and 4–6 years. Two doses are about 97% effective at preventing measles. Adults without evidence of immunity are recommended to have at least one documented dose; some adults at higher risk need two. A healthcare professional can help check records and whether an additional dose is appropriate.

• Ask a clinician if you are unsure or at higher risk. Recommendations can differ for adults, travelers, people with weakened immune systems and pregnant people. MMR is not appropriate for everyone. People who are or may be pregnant, or who have a weakened immune system because of a disease or treatment, should ask a healthcare professional before vaccination. See the CDC's MMR recommendations.

• If you may have been exposed, call promptly. Contact a healthcare provider or local health department rather than waiting for symptoms. The CDC says MMR given within 72 hours of an initial exposure may provide some protection or make illness milder; people at high risk of severe disease may be considered for immune globulin within six days. A clinician can determine whether either option is appropriate.

• Call ahead if symptoms develop. Fever, cough, runny nose, red or watery eyes and a rash can be signs of measles. Stay home and call a clinic before visiting so staff can prevent exposing other patients.

• Use the local notice if it applies to you. Anyone who was at Marshfield Medical Center–Weston's emergency department between 1:30 p.m. and 3:30 p.m. on November 5 should read the Wisconsin DHS exposure guidance. The state advises potentially exposed people to check their vaccination status and monitor for symptoms for 21 days.

These are public health recommendations, not a diagnosis or personal medical assessment. A clinician or local health department can help determine what steps apply to an individual situation.

What is still unknown and what should readers watch next?

The national case count is not a complete count of every infection. The CDC's page includes confirmed cases reported by jurisdictions as of a weekly cutoff, while probable cases and newer state reports may not yet appear. The agency cautions that case totals can change as investigations and confirmations continue.

There is also a gap between the federal and state measles-death totals. The CDC page currently lists four deaths and says that number may change as reviews are completed. Reuters reported that Pennsylvania, Wisconsin and New York health officials had separately reported measles-associated deaths beyond the CDC's current total. The CDC says it is working with the Council of State and Territorial Epidemiologists on a standard definition so deaths are classified and reported more consistently.

Another milestone is approaching. The Pan American Health Organization's Regional Verification Commission is scheduled to meet November 10–13, 2026, to review measles and rubella elimination status across the Americas, including the United States. PAHO says the review will consider vaccination coverage, surveillance, laboratory evidence and outbreak response; no single data point determines a country's status. See PAHO's meeting announcement.

FAQ

How many confirmed measles cases has the United States reported in 2026?

The CDC counted 5,182 confirmed cases as of November 5, 2026, in an update published November 6. The figure is more than double the 2,289 confirmed cases reported for all of 2025.

Why can state measles numbers differ from the CDC total?

The CDC's national page counts confirmed cases reported to the agency by its Thursday cutoff. States update their own dashboards on different schedules and may also publish probable cases, so a state total can be newer or broader than the federal figure.

How effective is the MMR vaccine against measles?

The CDC says two doses of MMR vaccine are about 97% effective at preventing measles. The recommended schedule for children is usually one dose at 12–15 months and a second at 4–6 years; adults should check their records and individual risk with a healthcare professional.

What should someone do after a possible measles exposure?

Contact a healthcare provider or local health department promptly, and call ahead before going to a clinic if symptoms develop. People who may have been exposed should follow the instructions from their local health department, which can account for the location, timing and vaccination status involved.

Has the United States lost its measles elimination status?

No final status change has been announced. PAHO's regional commission is scheduled to review the United States and other countries at its November 10–13, 2026, meeting.

Bottom line

The 5,182 confirmed-case count is a serious warning, but the weekly CDC figure is not a complete real-time tally of every infection. Check vaccination records, use local health department exposure notices and speak with a healthcare professional if you are unsure what protection or follow-up applies to you.