EA Serman, B Witrick, L Rennett. NEJM 2026; DOI: 10.1056/NEJMc2604004.
Clusters of Concern — Spatial Link between Childhood Undervaccination and Measles Outbreaks in South Carolina

An excerpt:

As of April 8, 2026, South Carolina had 997 confirmed cases of measles, of which 95.3% were reported to be among unvaccinated residents.² Of these cases, 90.8% occurred in children (<18 years of age).² Thus, school-based vaccination patterns provide a reasonable indicator of local pediatric susceptibility in the communities where transmission has occurred…

Spartanburg County (population, 380,000) was identified as the dominant cluster, containing 27 of 109 hot-spot tracts (24.8%). Of the 997 reported measles cases in the state, 940 (94.3%) occurred in Spartanburg County…

The mean vaccination coverage was lower in the schools with reported measles cases (coverage, 83.9%) than in those with no reported cases (coverage, 92.9%)…The locations of the 30 schools with measles exposure were not uniformly distributed: 26 (87%) were located within or adjacent to undervaccinated hot-spot tracts

In other health news, there is a reason why milk is pasteurized:

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