Find the latest numbers of confirmed U.S. measles cases. CDC updates this page weekly.
Measles is a highly contagious virus. Two doses of the MMR vaccine provide the best protection.
Learn what to do for measles symptoms or exposure, including when to get emergency care.
First signs of measles are fever, cough, & runny nose 7–14 days after infection.
For Healthcare and Public Health Professionals
Learn what to do if you suspect your patient has measles or was exposed to measles.
Learn about clinical diagnosing and treating measles cases.
- Find answers to questions about measles, MMR recommendations, and isolation for measles.
- Use this toolkit to help you communicate, prepare, and respond to measles cases and outbreaks.
- Get key measles resources including case definitions and outbreak and response procedures.
- Detection of measles RNA by RT-PCR can provide laboratory confirmation of infection.
- Find routine MMR information, evidence of immunity, other considerations for measles vaccine.