A recent measles case in San Mateo County, caused by travel, was confirmed by health officials who conducted contact tracing and found no further risk. This case was made public as part of the department's policy, which does not disclose investigation details unless there is an ongoing health threat. Notably, the CDC has reported a resurgence of measles, with 483 confirmed cases in 2025, predominantly affecting unvaccinated individuals and primarily children and teens under 19.
"In this case, our investigators were able to reach everyone considered a potential exposure, and there was no further risk," the health department said.
The CDC recorded 483 confirmed cases of measles in 2025, compared to only 285 total cases in 2024.
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