More health coverage. In 2000, public health officials in the United States declared the measles outbreak threat eliminated. Twenty-five years later, the country is on the verge of losing that status for the first time.
The U.S. has recorded 1,288 measles cases so far this year, according to the U.S. Centers for Disease Control and Prevention, the highest annual count in more than three decades, according to reporting by the Associated Press apnews.com. Three people have died, two children in Texas and an adult in New Mexico, and dozens more have been hospitalized. The CDC count is already 14 cases higher than all of 2019, when America nearly lost its elimination status the first time.
Measles is not just a problem in Texas. Fourteen states now have active outbreaks, and four other states have had outbreaks that ended. The largest began five months ago in undervaccinated communities in West Texas and seeded outbreaks in New Mexico and Kansas.
Why This Is Happening Now
The short answer is that vaccination rates among children have been falling. According to the United Nations, 14 million children worldwide did not receive a single vaccine in 2024, the highest share of unvaccinated children since tracking began more than a decade ago, as reported by the Associated Press apnews.com.
In the United States, kindergarten MMR vaccination rates have dropped below 95 percent, the threshold needed to prevent measles from spreading, in a growing number of states. Some school districts in Texas and Oregon now report MMR coverage in the 80s, low enough that a single infected student can spark a multi-month outbreak.
The shift is being driven by several things at once. Vaccine misinformation has grown on social media. Public health messaging after the COVID-19 pandemic broke trust with some parents. Religious and philosophical exemptions to school vaccine requirements have expanded in several states. And the federal health leadership under Health and Human Services Secretary Robert F. Kennedy Jr., a long-time vaccine skeptic, has sent mixed signals about which vaccines are recommended and when.
The Diseases Gen Z Thought Were History
Measles is the loudest outbreak, but it is not the only one making a comeback.
Pertussis, also known as whooping cough, has surged in the United States, Europe, and China over the past two years. According to the World Health Organization, global pertussis cases in 2024 were the highest since 2019. In some U.S. states, whooping cough cases in 2025 are running four to five times above the pre-pandemic average.
The pattern repeats across the vaccine schedule. Polio, declared eliminated in the Americas in 1994, has resurfaced in wastewater in several U.S. cities, though no new cases of paralytic polio have been confirmed. Mumps outbreaks have hit college campuses. Rubella, once thought to be on the verge of eradication, has been climbing in parts of East Africa and South Asia. More health coverage
The diseases are different but the cause is the same: when vaccination rates fall below the herd immunity threshold, the pathogens come back.
What the Long-Term Damage Looks Like
Measles is not just a fever and a rash. In a small share of cases, the virus causes a delayed, progressive, and fatal brain disease called subacute sclerosing panencephalitis, or SSPE, that can show up years after the initial infection, according to reporting by the Associated Press apnews.com. A child in Los Angeles died of SSPE in 2025 after contracting measles as a toddler. Children who survive measles can also suffer lasting immune damage that makes them more vulnerable to other infections for months afterward.
Pertussis is most dangerous for babies too young to be vaccinated. The coughing fits can be so severe they cause brain damage or death, which is why the vaccine is recommended for pregnant women in the third trimester.
These are the realities that public health officials are trying to communicate, and the realities that vaccine skeptics often discount.
Where the Policy Fight Stands
The 2026 political map is making the public health fight harder.
Several Republican-led states have moved in the past year to loosen school vaccine requirements, including proposals to make it easier to claim religious exemptions. Several Democratic-led states have moved in the opposite direction, tightening requirements and removing non-medical exemption options.
The federal government has stopped short of forcing states to change their school vaccine laws. The CDC continues to recommend the standard childhood vaccine schedule, but the agency's public communications have grown quieter and less specific in some areas. Several major medical organizations, including the American Academy of Pediatrics and the American Medical Association, have publicly reaffirmed their support for routine childhood vaccination.
For Gen Z, the question is whether the generation that came of age during COVID will trust vaccines less, or more. Early data is mixed. According to a recent KFF survey, vaccine confidence among Americans under 30 is lower than among older adults, but support for school vaccine requirements remains a majority position even among younger parents.
The diseases that came back did not come back because of politics. They came back because too many people skipped a shot. The only thing that sends them away again is the same thing that sent them away the first time.
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