An infant in southwestern Wisconsin has died of measles, the state’s first death from the disease in 36 years, health officials announced on Thursday.

Key Points

  • An infant in southwestern Wisconsin has died of measles, the state’s first measles death since 1990.
  • The coroner listed measles as the immediate cause of death. Officials released no further details about the child to protect the family’s privacy.
  • Wisconsin has recorded 431 measles cases in 2026 across 13 counties, the most in more than 35 years. All but three of the cases were in unvaccinated people.
  • Nine people have been hospitalised in the outbreak.
  • It is the third measles death reported by a US state this week. The CDC has confirmed four measles deaths nationally this year, while state health departments report at least eight.

What happened: a baby dies as Wisconsin’s outbreak spreads

Wisconsin health officials confirmed on Thursday that an infant in the southwestern part of the state has died after contracting measles. It is the first measles death in Wisconsin since 1990. The state Department of Health Services said a coroner listed measles as the immediate cause of death, and it will release no further information about the child, including age or county of residence, to protect the family’s privacy.

“My heart is broken for the family,” Kirsten Johnson, the department’s secretary, said in a statement. “Any death of a child is a tragedy and even more so when it is related to a vaccine-preventable disease.”

The death comes as Wisconsin’s outbreak keeps growing. As of 3 November, the state had recorded 431 measles cases across 13 counties, the highest count in more than 35 years. All but three of those cases were in people who had not been vaccinated, and nine people had been hospitalised. Health officials warn the true number is likely higher, because not everyone who falls ill seeks care or gets tested.

Why it matters: a disease the US once eliminated is killing children again

The United States stopped the domestic spread of measles in 2000, after decades of high vaccination rates. But coverage has slipped in recent years to below the 95% level needed to keep outbreaks from taking hold, and the virus has returned. Measles is one of the most contagious diseases known: it spreads through the air, and it can linger in a room long after an infected person has left.

Babies are among the most exposed. Children cannot receive their first measles shot until they are 12 months old in standard practice, though health authorities say infants as young as six months can be vaccinated during an outbreak. That leaves the youngest children depending on the people around them being vaccinated — the community protection that health officials call herd immunity. When vaccination rates fall, that shield thins first around those who cannot protect themselves.

Two doses of the measles vaccine are 97% effective at preventing infection, according to health authorities. The same protection is not only about avoiding a rash and fever: measles can cause pneumonia and brain swelling, and in a small share of unvaccinated children it is fatal. Health experts estimate that between one and three in every 1,000 unvaccinated children who catch measles die from breathing or brain complications.

Wisconsin’s death is the third reported by a US state this week, after an infant died in New York and another person died in Pennsylvania. The Centers for Disease Control and Prevention has confirmed four measles deaths in the United States this year, but state health departments report at least eight. Three people died of measles in the US in 2025; before last year, the most recent American measles death was in 2015. The CDC has recorded 4,852 measles cases across the country this year.

What happens next: vaccination push as cases keep climbing

Wisconsin’s health department is urging anyone who is unvaccinated to get the measles shot, and parents to check that their children’s vaccinations are up to date. The outbreak is concentrated in the southwest of the state, where three counties — Lafayette, Grant and Iowa — account for more than 90% of cases, but infections have now been confirmed in 13 counties, and officials expect the count to rise.

The wider question is whether the national picture will follow the same course. Measles cases have surged across the United States this year, and health officials say the pattern is driven by pockets of low vaccination rather than by the virus changing. What happens next in Wisconsin — and in the other states reporting deaths this week — will show whether the vaccination push can close those gaps before more children are exposed.

The national picture is part of a wider American story playing out this week: read our report on Trump declaring the Oval Office a national monument and on Newsom commuting all 548 California death sentences.

Sources: Wisconsin Department of Health Services / Associated Press / CIDRAP | 6 Nov 2026. The death was announced on Thursday 5 November 2026 (US time); case counts are as of 3 November 2026.