The Centers for Disease Control says 30 states now have reported measles outbreaks. Alaska and Ohio are the newest states to be added to the list.
Numbers were reported as of July 18th - reaching 1,148 cases, 25 more from the previous week.
The number of cases so far this year is the largest reported in the U.S. since 1992 and since measles was declared eliminated in 2000.
Signs and symptoms of measles include high fever, cough, runny nose and watery eyes.
CDCÂ experts say the measles rash appears three to five days after infection.
Measles can be dangerous for babies and young kids.
If you think you've been exposed, call your doctor immediately.Â
The CDC recommends people get the Measles, Mumps and Rubella - or MMRÂ -Â vaccine for protection.
The CDC says when taken in the recommended two doses, the MMR vaccine is 97% effective at preventing measles.
Measles spreads through the air when an infected person coughs or sneezes.
So far, measles has only been reported in Clark County in Nevada.Â
