U.S. Measles Surge Leaves Unvaccinated Infants Highly Exposed
An Associated Press investigation details how the United States is seeing its worst measles activity in more than 35 years, with a roughly 1,000‑case outbreak centered in Spartanburg County, South Carolina, 17 separate outbreaks already this year, and 48 last year, putting the country on the brink of losing its official measles‑elimination status. The piece focuses on babies younger than 12 months who are too young for routine MMR vaccination and must rely on herd immunity, which requires about 95% coverage but has fallen below 90% in some South Carolina schools. Pediatricians there have begun using existing guidance to administer MMR earlier — at 6–9 months and accelerating the second dose — yet say state health officials will not release infant‑specific case or hospitalization data, citing confidentiality and gaps in hospital reporting. The article situates these outbreaks in a broader policy shift in which HHS Secretary Robert F. Kennedy Jr., a longtime vaccine opponent, has overseen major public‑health cuts while state lawmakers across the country introduce bills that would loosen school mandates and likely drive coverage even lower. Doctors warn that in this climate, infants are ‘sitting ducks’ for a virus that can cause pneumonia, brain swelling, and death, and public‑health experts online are flagging the story as evidence that U.S. measles control is eroding not just from individual hesitancy but from deliberate political decisions reshaping vaccine policy.
📌 Key Facts
- South Carolina’s measles outbreak has reached roughly 997–1,000 cases, making it the worst state outbreak and part of the largest U.S. measles activity in more than 35 years.
- At least 253 cases in that outbreak are in children ages 4 and younger, while some Spartanburg County schools have vaccine coverage below 90%, well under the 95% herd immunity threshold.
- Pediatricians in Greer and elsewhere in South Carolina are administering MMR as early as 6 months and accelerating second doses, but state officials refuse to release infant‑level data and do not systematically track infant measles hospitalizations.
- Nationwide there were 48 measles outbreaks last year and 17 so far this year, pushing the U.S. close to losing its measles‑elimination status as HHS Secretary Robert F. Kennedy Jr. pursues vaccine‑skeptical policies and public‑health budget cuts.
- Doctors and public‑health advocates say a growing wave of state bills to weaken school vaccine requirements could further depress MMR uptake and increase the risk for infants who cannot yet be vaccinated.
📊 Relevant Data
In a 2023-2024 survey of 19,892 parents of children younger than 5 years, the MMR vaccination rate was 81.2% for children of White parents compared to 57.4% for children of Black parents, with U.S. population percentages approximately 60% White and 13% Black.
Parental Factors Associated With Measles–Mumps–Rubella Vaccination in US Children Younger Than 5 Years — American Journal of Public Health
In the same 2023-2024 survey, the odds ratio for MMR vaccination was 0.50 for children of Hispanic parents compared to White parents, indicating substantially lower rates, with U.S. population percentages approximately 19% Hispanic.
Parental Factors Associated With Measles–Mumps–Rubella Vaccination in US Children Younger Than 5 Years — American Journal of Public Health
In 2026, 10 measles cases were reported among international visitors to the United States, with 17 new outbreaks reported and 94% of cases in unvaccinated or unknown vaccination status individuals.
Measles Cases and Outbreaks — Centers for Disease Control and Prevention
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