Measles Activity in California 202​5

These data are provisional and subject to change.  CDPH will update this page every Tuesday.

What is Measles?

Measles is a contagious viral disease. It's widespread in many parts of the world, including Europe, Africa and Asia. While measles is eradicated in the U.S., cases around the country and world remind us how important vaccines are. 

The measles-mumps-rubella (MMR) vaccine provides the best protection against disease and serious illness. Most measles cases in the U.S. result from international travel. It's important that you and your family are up to date on all vaccines before traveling abroad.

Measles begins with a fever that lasts a couple of days. It's followed by:

• ​A cough
• Runny nose
• Conjunctivitis (pink eye)
• Rash

The rash usually appears on the face, along the hairline and behind the ears. Then it affects the rest of the body. Those infected can spread measles about four days before their rash starts to four days afterwards. ​​

How Do I Protect Myself?

MMR vaccines are our best defense against the disease and its complications.

CDC recommends two doses of MMR (measles, mumps, rubella) vaccine for:

• Children: one dose at 12 months of age and another at 4-6 years. 

• Older children, adolescents and adults without documented doses of MMR vaccine.

Unsure if you're vaccinated against measles? Check your CA Digital Vaccine Record (DVR) or ask your healthcare provider. If no records exist, get vaccinated.​

What's Recommended for International Travel? 

Whether you're visiting family or exploring the world, plan to receive the MMR vaccine. It takes your body 2-3 weeks to get the most protection against measles after vaccination.

Before international travel:

• Babies 6-11 months of age should receive one dose of MMR vaccine. 

• Ensure everyone 12 months and older are up to date with 2 doses of MMR vaccine. If they're not up to date, they should get two doses at least 28 days apart.