
California measles resurges as wastewater signals hidden spread
California reports 74 measles cases across seven counties—the most in seven years—amid rising transmission detected in Merced County wastewater, suggesting undetected circulation. Officials cite immunity gaps, with about 96% of those infected unvaccinated or with unknown vaccination status, and warn that clustered pockets of unvaccinated people enable spread even as roughly 95% of kindergarteners are vaccinated. The surge reflects a broader national trend of increasing measles activity.











