The notice from the Wisconsin Department of Health Services came on Thursday, November 5. An infant in the southwest of the state had died, and the coroner had written measles as the immediate cause. According to the department’s release, no one in Wisconsin had died this way since 1990.
After that the state said almost nothing. To protect the family, it gave neither the child’s age nor whether the child had been vaccinated. What it did give was grief, in the words of the health secretary, Kirsten Johnson, which Newsweek reported: “It is with a heavy heart that we are reporting the first death of an infant connected with a measles outbreak in Wisconsin in many years. My heart is broken for the family.”
It was the third measles death reported in the United States that week. An infant had died in New York. In Pennsylvania a woman died on Wednesday, shortly after giving birth.
The arithmetic of one state
By November 3 Wisconsin had recorded 431 cases this year across 13 counties, the most in more than 35 years. Two weeks earlier the count had been 335. In all of 2025 the state saw just 35 cases, most of them brought home from abroad. Now the virus moves through domestic travel and from neighbour to neighbour. All but three of the infected were unvaccinated, CIDRAP reported. Nine people have been hospitalised, some with brain swelling and pneumonia. The health department warns that the real number is almost certainly far higher, because not everyone who falls ill sees a doctor.
The explanation is a simple fraction. About 85 percent of Wisconsin’s kindergarteners are vaccinated against measles, below the national average of 92 percent. Officials say 95 percent is needed to hold the disease back. “That’s really the central issue here: Measles is now spreading because there are enough people who are susceptible to infection for the virus to continue finding new hosts,” Dr. Ryan Westergaard, the state’s chief medical officer, told CNN.
Since August 1 the state has delivered 2,000 doses of MMR vaccine to local health departments in communities with confirmed cases. Around 500 have gone into infants. The shot can be given from six months of age, and two doses are 97 percent effective.
Counting the dead
The national figures are larger and less certain. Al Jazeera reported that the Centers for Disease Control and Prevention had confirmed 5,182 cases so far in 2026, the most since 1991, and that almost 60 percent were children and teenagers. The CDC’s own page, updated November 6, gives that number as of November 5, with cases in 47 jurisdictions and about 96 percent linked to outbreaks. Newsweek, working from an earlier tally, put the figure at 4,842, still more than double the 2025 total.
The dead are harder to count. The CDC lists four, with an asterisk. State health departments report more. ABC News counts eight: six in Pennsylvania, one in New York and one in Wisconsin. Until last year, the last confirmed measles death in the United States had been in 2015.
The gap has a history. Writing for Ars Technica, Beth Mole recounts how Health Secretary Robert F. Kennedy Jr., an opponent of vaccines, falsely suggested that Pennsylvania officials had “fabricated” the first deaths there, and reportedly ordered the CDC to remove them from its national data. The agency then dropped its long-standing practice of reporting deaths confirmed by the states. It now waits for federal death records, which are slow to process and were never meant to track an outbreak as it happens. As rews has reported, the country is losing count of its measles dead, and the federal and state tallies have drifted apart. The CDC now says it is working with the Council of State and Territorial Epidemiologists on a standard definition of a measles death.
A reflection, not a finding: a government that cannot stop a death can always change how it records one.
Pennsylvania shows what that looks like up close. On October 12 the Franklin County coroner announced the death of a 39-year-old woman. The coroner, Jordan Conner, recorded it as “a probable acute cardiac event due to possible complications of the measles,” noted that she had recently been diagnosed and treated for the disease, and said the death met the state’s definition: death within 30 days of a positive test, with clinical signs of infection and no other significant cause. On Thursday the state health department told Ars Technica that it “has not found any Franklin County cases” meeting those criteria, but that “the investigation has not yet been closed.” The coroner did not respond to questions about the discrepancy. The coroner withheld the woman’s name and a county judge sealed it. The Philadelphia Inquirer has gone to court for more information.
Pennsylvania’s outbreak began in April and is the worst in the country, with more than 1,500 cases across 45 counties. In October, after more than 100 cases, New York’s governor, Kathy Hochul, declared a statewide disaster. “No one should get seriously ill or die from a vaccine-preventable disease,” she said.
What was won in 2000
In 2000 the United States declared measles eliminated, after a year without continuous domestic transmission. Before vaccination the virus infected 3 to 4 million Americans a year, put nearly 50,000 in hospital, caused 1,000 cases of brain swelling and killed 400 to 500 people. Health experts blame its return on falling vaccination rates and the spread of anti-vaccine misinformation.
From November 10 to 13, a committee of infectious disease experts convened by the Pan American Health Organization, the World Health Organization’s regional office, will review data from 2025 and early 2026 to decide whether measles has re-established itself in the United States. Ars Technica judges that the country will probably lose its elimination status.
The CDC, for its part, says it will revise its death count “as additional information becomes available and relevant reviews are completed.”