For Clinicians
Measles Situation Update
June 11, 2025
As of June 5, 2025, 1,168 confirmed measles cases have been reported by 34 jurisdictions in the U.S. This is more than triple the number of measles cases in the U.S. in all of 2024.
There have been 17 outbreaks (defined as 3 or more related cases) reported in 2025, and 89% of cases are outbreak-associated. For comparison, 16 outbreaks were reported during 2024 and 69% of cases were outbreak-associated. As of June 9, 2025, 14 confirmed measles cases have been reported in California in 2025
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Consider measles in any patient presenting with a febrile rash illness, especially if unvaccinated for measles or traveled internationally in the last 21 days. The AMA/CDC Be on Alert for Travel-Related Measles webinar may be a helpful resource.
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If you suspect measles in a patient, please follow the steps listed in this infographic.
- Patients with suspected measles should be placed in an Airborne Infection Isolation Room immediately, if possible. Detailed infection control guidance can be found here.
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Suspect measles cases should be reported to ACPHD by phone immediately, and while the patient is still present if possible. M-F 8:30AM-5PM: (510) 267-3250; after-hours: (925)422-7595.
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Collect Respiratory swab (NP or OP (OP is preferred specimen type)) and urine for measles PCR testing at the Alameda County Public Health Lab with approval from ACPHD. When directed, serum samples for Measles IgM/IgG should be collected and routed to the California Department of Public Health-Viral and Rickettsial Disease Lab (VRDL). Do NOT use commercial laboratories for suspect measles cases. For detailed instructions, please see ACPHD’s Measles Testing & Specimen Routing Procedures document.
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Ensure patients with suspected measles understand that they must isolate pending test results.