The US has now recorded 5,182 confirmed measles cases in 2026, more than double last year’s total, and three states reported measles deaths in the first week of November alone. The figures come from the CDC’s weekly update on 6 November, and this month the Pan American Health Organization (PAHO) is due to review whether the US is still officially “measles-free”.
If you’re wondering whether you or your children are protected, the short answer is this: two documented doses of MMR vaccine give about 97% protection against measles. Below is what’s happening, who’s at risk, and how to check your own status, whether you live in the US, the UK or elsewhere.
What happened
The CDC counts confirmed cases reported by state health departments each week. As of 5 November 2026:
- 5,182 confirmed cases this year, up from 4,852 a week earlier
- cases in 47 jurisdictions, plus 18 among international visitors
- 43 new outbreaks in 2026, with 96% of all cases linked to an outbreak
- 4 deaths in the CDC’s official count, which it says may change
For comparison, the US had 2,289 cases in all of 2025 and 1,274 in 2019, which was itself a bad year. Contagion Live’s weekly tracker notes that 2026 is now the highest annual total since 1991.
State health departments have reported more deaths than the CDC tally shows. In the week of 2 November, New York reported a child’s death, Pennsylvania reported its sixth measles death of the year, and on 5 November the Wisconsin Department of Health Services announced an infant had died, the state’s first measles death since 1990. Wisconsin alone has 431 cases across 13 counties.
Is the US losing its measles-free status?
Possibly. “Elimination” doesn’t mean zero cases. It means the same strain of measles hasn’t spread continuously inside a country for 12 months or more. The US earned that status in 2000.
In March 2026 PAHO confirmed it would review the US and Mexico at its regular commission meeting in November 2026, looking back to outbreaks that began in January and February 2025. Canada already lost its status in November 2025, after the virus circulated there for more than a year. Losing the label wouldn’t change medical advice, but it would confirm measles is spreading locally again rather than only arriving with travellers.
What changes for you
Measles is one of the most contagious infections known. According to the CDC, up to 9 in 10 people without immunity who are close to an infected person will catch it, and the virus can hang in the air of a room for up to two hours after the sick person has left. People are infectious from 4 days before the rash appears until 4 days after, so they often spread it before they know they’re ill.
That means outbreaks find gaps fast. If you’re fully vaccinated, your risk stays very low. If you’re not, or you’re not sure, now is the time to check.
Who is most at risk
- Babies under 12 months, who are usually too young for their first routine dose.
- Children under 5 and adults over 20, who are more likely to have complications.
- Pregnant women without immunity.
- People with weakened immune systems, for example from chemotherapy or some medicines.
- Anyone who never had two doses, including adults who missed vaccines as children.
The CDC says about 1 in 5 unvaccinated people in the US who get measles end up in hospital. Up to 1 in 20 children with measles get pneumonia, about 1 in 1,000 develop brain swelling (encephalitis), and nearly 1 to 3 in 1,000 children who are infected die.
Check your protection: MMR by country
| Country | Routine childhood doses | Adults |
|---|---|---|
| United States | MMR at 12 to 15 months and 4 to 6 years | At least one documented dose; two doses (28 days apart) for students after high school, healthcare workers and international travellers. People born before 1957 are generally considered immune. |
| United Kingdom | MMRV at 12 months and 18 months | If you missed doses, ask your GP for two doses at least one month apart. People born between 1970 and 1990 are a priority group. |
| Babies 6 to 11 months (US and UK) | An early extra dose may be offered before travel, after contact with measles, or during an outbreak | This early dose doesn’t count toward the routine two, so the usual doses still follow. |
Sources: CDC MMR vaccine guidance and the NHS MMR vaccine page. In India, Canada, Australia and other countries, ages differ, so check your national schedule or ask your doctor.
What to do now
- Find your records. Look for a childhood vaccine card, your GP or doctor’s records, or a state immunisation registry.
- If you can’t find proof, ask about a blood test or simply get vaccinated. An extra MMR dose isn’t harmful if you were already immune.
- Check your children’s schedule and book any missed doses now rather than waiting for the next routine visit.
- Planning international travel? The CDC says everyone should be fully vaccinated before leaving, and babies aged 6 to 11 months should get an early dose.
- If you live near an outbreak, follow your local health department’s advice, which may include early doses for infants.
Symptoms to watch for
Symptoms usually start 7 to 14 days after exposure. Early signs look like a bad cold:
- high fever, which can go above 40°C (104°F)
- cough and runny nose
- red, watery eyes
- tiny white spots inside the mouth (Koplik spots), 2 to 3 days in
- a blotchy red rash 3 to 5 days after symptoms start, beginning at the hairline and spreading down the body
High fever with a rash can have other causes, as our guides on typhoid vs dengue and chikungunya explain, which is why a proper diagnosis matters.
When to see a doctor
Phone your doctor, clinic or health line (NHS 111 in the UK) before going in if you or your child has a fever and rash, or you’ve been near someone with measles and aren’t immune. Calling ahead lets them keep you away from babies and other patients in the waiting room.
Get emergency help if someone with measles has trouble breathing, is very drowsy or hard to wake, has a seizure, or seems confused. Call your local emergency number (911 in the US, 999 in the UK, 112 in the EU and India).
What’s still unclear
- When PAHO will publish its decision on US elimination status.
- The true number of cases, since the CDC only counts confirmed cases reported to it and not everyone who’s ill gets tested.
- How many deaths the CDC will add to its official tally, which currently lags behind state reports.
Frequently asked questions
I had the MMR as a child. Do I need another dose?
If you have records of two doses, you’re considered protected for life and don’t need a booster. If you only had one, or aren’t sure, ask your doctor whether a second dose makes sense.
Can vaccinated people still get measles?
Rarely. Two doses are about 97% effective, so a small number of vaccinated people can still catch it, but they usually have a milder illness and are less likely to spread it.
Can I get the MMR vaccine when I’m pregnant?
No. MMR is a live vaccine and isn’t given during pregnancy. If you’re planning a pregnancy, check your immunity first. If you’re already pregnant and exposed to measles, contact your doctor or midwife straight away.
How long after exposure can the vaccine still help?
Getting vaccinated quickly after exposure can sometimes prevent illness or make it milder, so call your doctor or health department the same day if you think you’ve been exposed.
Is measles only a problem in the US?
No. Outbreaks have hit Canada, Mexico and parts of Europe and Asia in recent years. Wherever you live, two doses of measles vaccine are the best protection.
For more on protecting your family through the winter, see our guides on getting through flu season and warning signs of breathing problems in children.
This article is for general information and is not a substitute for advice from a doctor. If you have symptoms or a health condition, please consult a qualified healthcare professional.
