The United States recorded its tenth measles death this year on Friday, marking the deadliest outbreak in over three decades as vaccination rates continue to decline and parents face mounting pressure to make informed choices about their children’s health.
Latest Fatalities in Pennsylvania and Wisconsin
Pennsylvania and Wisconsin each reported a new measles-related death on Friday. The Wisconsin Health Department confirmed the death of a child but provided no additional details out of respect for the family’s privacy. Pennsylvania’s latest fatality was an unvaccinated resident of Montour County who tested positive for the highly contagious virus. Pennsylvania has now recorded seven measles deaths this year, Wisconsin two, and New York one. None of these states had seen a measles death in more than 30 years before this outbreak.
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Record Case Numbers and Declining Vaccination
Through Thursday, approximately 5,400 measles cases have been confirmed across the United States this year, more than double last year’s total and the highest count since 1991. Public health experts point to a sharp drop in vaccination rates as the primary driver behind the outbreak. Nationwide kindergarten vaccination rates for measles fell from 95 percent during the 2019-20 school year to 92 percent during the 2025-26 school year. According to an investigation, 75 percent of counties with measles vaccine data now fall below the 95 percent vaccination threshold needed to prevent outbreaks.
The virus, considered the most contagious known to humans, can cause deadly complications including pneumonia and brain swelling in unvaccinated individuals. At least four deaths this year occurred in infants too young to receive their first vaccine dose, typically administered around a child’s first birthday. In response, Pennsylvania and Wisconsin are now recommending an early dose for infants aged 6 to 11 months living in high-case areas. Two doses of the measles vaccine are 97 percent effective at preventing infection.
Elimination Status Under Review
The Pan American Health Organization, a division of the World Health Organization, met this week to determine whether the United States can maintain its measles-free designation. The decision hinges on whether continuous transmission has occurred for a full year. Measles was declared eliminated in the United States in 2000, meaning it was no longer spreading continuously, though occasional outbreaks could occur. Canada lost its elimination status last year after officials determined the virus had been spreading for at least 12 months. The organization’s decision regarding America’s status is expected on Tuesday.