Health experts say one shot of the MMR vaccine is 93% effective against measles and two shots increase that to 97%.

South Dakota confirms its first measles case of 2025 after an international traveler tests positive. Health officials warn of ...

At least 62 people with measles have traveled on planes this year, and one person was infected. But being fully vaccinated ...

Of the 2,066 counties the study looked at, 78% saw a decline in MMR vaccination rates. But rates can vary substantially ...