Stay Alert for Measles Cases. CDC Clinician Outreach and Communication Activity (COCA). January 25, 2024.
Between December 1, 2023, and January 23, 2024, the CDC was notified of 23 confirmed U.S. cases of measles. Due to the recent cases, healthcare providers should be on alert for patients who have: (1) febrile rash illness and signs and symptoms consistent with measles (i.e., cough, coryza, or conjunctivitis), and (2) have recently traveled abroad, especially to countries with ongoing measles outbreaks.

Measle cases often originate from unvaccinated or under-vaccinated U.S. residents who travel internationally and then transmit the disease to people who are not vaccinated against measles. Infected people are contagious from 4 days before the rash starts through 4 days afterwards