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Yolo County health officer warns of regional measles activity; suspected local case under investigation
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Summary
Public health staff said measles is resurging nationally and in California, described wastewater detections in the greater Sacramento sewershed and reported a suspected Yolo County measles case pending lab confirmation; county is monitoring exposed contacts and encouraging MMR vaccination for travelers and at‑risk communities.
Dr. Amy Cisenioli, Yolo County Health Officer, briefed the board and public on measles trends and local preparedness on March 24. She said national and state case counts have increased in 2025–26 and most infections occur in unvaccinated individuals. Yolo County had no confirmed cases in 2026 at the time of her prepared remarks but had recent cases in 2025 and 2024; regional outbreaks in neighboring counties have created exposure events affecting Yolo County residents.
The county monitors measles through case reporting and wastewater surveillance. Dr. Cisenioli said the Sacramento sewershed had detections of measles viral material in March and that at least 20 Yolo County residents had been identified as contacts of regional cases and were under 21‑day monitoring; to date there were no confirmed secondary cases in Yolo County but two contacts remained under observation. She emphasized the high labor and cost required for thorough measles case investigations—citing an example investigation that consumed approximately 375 staff hours and cost about $23,000.
Dr. Cisenioli encouraged vaccination: two doses of MMR are about 97% effective; early vaccination (as young as six months) may be indicated for travelers to outbreak areas and to some high‑risk domestic destinations that attract international visitors (such as theme parks). She noted kindergarten vaccination coverage in most Yolo County schools meets the 95% threshold for herd immunity; however, several schools in West Sacramento had lower coverage and the county is emphasizing outreach and translated materials in Spanish, Russian and Ukrainian. Late‑breaking information near the end of the meeting: a local hospital reported a suspected Yolo County measles case pending laboratory confirmation.
County public health will continue contact monitoring, targeted outreach in communities with lower vaccination coverage and coordination with healthcare partners. Dr. Cisenioli asked providers and residents to be alert for measles symptoms and to confirm vaccination records where appropriate.
