Measles in the US: a fourth death, and what UK travellers should check

What happened

Pennsylvania has reported a fourth measles-related death this year, in an outbreak that has been growing through 2026. The death was reported on 15 September 2026. It has been decades since the United States recorded this many measles deaths in a single year. The last time there were four was 1992. The most recent death was an unvaccinated 18-year-old from Mifflin County. They died from acute disseminated encephalomyelitis, a rare condition affecting the brain and spinal cord that can follow an infection. Earlier, the state reported two deaths in infants who had measles. A coroner in Jefferson County also reported the death of a 40-year-old woman. Pennsylvania has counted 693 measles cases across 38 counties so far this year. There is a complication in the reporting. The US Centers for Disease Control and Prevention has not counted any measles deaths in 2026, saying it does not have enough information to determine whether measles caused or contributed to the first two fatalities.

Why this matters

Measles has a reputation as a mild childhood illness. That reputation is wrong. It is one of the most contagious diseases known. The virus stays in the air for up to two hours after an infected person has left a room. If you are not immune and you are exposed, you are very likely to catch it. Most people recover. A minority do not. Complications include pneumonia, and swelling of the brain, which can cause lasting damage or death. For travellers, the relevance is straightforward. Measles does not respect borders. Outbreaks abroad become cases at home when unprotected people travel. This matters particularly for the UK right now, because MMR vaccination coverage here has fallen below the level needed to stop the disease spreading. That leaves pockets of the population susceptible. It is also worth noting who is most at risk: babies too young to be vaccinated, pregnant women, and people whose immune systems are weakened. Those groups depend on everyone else being immune.

What the evidence actually says

A few points deserve care here. The case count of 693 in Pennsylvania is a state figure for the year to date. It is not a national US total, and it is not a reason to avoid travelling to the United States. The disagreement over the death count is genuine and worth understanding rather than ignoring. Pennsylvania's health authorities have attributed deaths to measles-associated illness. The CDC has said it lacks sufficient information on some of them. That is a difference in how deaths are classified, not a claim that nobody died. On the fourth death specifically, acute disseminated encephalomyelitis is a recognised, though rare, complication that can follow a viral infection including measles. On protection, the evidence is unusually strong and has been for decades. Two doses of the MMR vaccine are about 99% effective at preventing measles. It is one of the most reliable vaccines in routine use. What the evidence does not support is any link between MMR and autism. That claim originated in a study that was retracted, and it has been examined and rejected in very large studies involving millions of children since.

Qurexa perspective

Travel vaccination questions come up constantly in community pharmacy, usually about two weeks before someone flies, which is often later than ideal. The useful thing to know is that MMR is free on the NHS at any age if you have not had two doses. You do not need to be a child, and you do not need to pay a private clinic for it. If you are unsure what you have had, your GP practice holds your vaccination record and can check. It takes one phone call. That is worth doing before booking anything, rather than in the week before you fly.

Practical advice

If you are travelling to the United States, or anywhere with measles circulating, here is what to do. **Check you have had two doses of MMR.** Your GP practice can confirm. Many adults born in the late 1970s and 1980s had only one dose, or none. **If you are not fully vaccinated, get it sorted early.** MMR is free on the NHS at any age. Ideally have the second dose at least two weeks before you travel, though even one dose gives substantial protection. **Do not vaccinate during pregnancy.** MMR is a live vaccine and is not given in pregnancy. Speak to your midwife or GP about protection if you are pregnant and planning travel. **Know the symptoms.** Measles usually starts with a high temperature, a cough, sore red eyes and a runny nose, with a blotchy rash appearing a few days later, typically starting on the face. **If you suspect measles, phone ahead.** Call your GP or NHS 111 before going in, so they can avoid exposing others in the waiting room. Do not just turn up. **Check your travel insurance.** Make sure it covers medical treatment in the US, where costs are extremely high. **Check FCDO advice before you go.** Travel advice for the United States is published on GOV.UK and is updated when things change.

What to know

Pennsylvania has reported a fourth measles-related death in 2026 and 693 cases across 38 counties. The most recent death was an unvaccinated 18-year-old. This is the highest US measles death toll in a year since 1992. The CDC has not counted these deaths, citing insufficient information, which is a classification dispute rather than a denial. Measles is extremely contagious and can cause pneumonia and brain swelling. Babies, pregnant women and immunosuppressed people are most at risk. Two doses of MMR are around 99% effective and are free on the NHS at any age. Check your record before you travel. Sources: CNN, 'Pennsylvania reports fourth measles-related death, the most in US in decades', 15 September 2026, https://www.cnn.com/2026/09/15/health/pennsylvania-measles-deaths-outbreak; The Guardian, 'Fourth person dies of measles-associated illness in US', 15 September 2026, https://www.theguardian.com/us-news/2026/sep/15/pennsylvania-measles-outbreak-death; NHS, 'MMR vaccine', https://www.nhs.uk/vaccinations/mmr-vaccine/. This article is for general information and does not replace advice from a doctor, pharmacist or other qualified healthcare professional.