MMR

“Extensive research demonstrates that the MMR vaccine is safe and significantly reduces the risk of contracting measles, a disease that can lead to severe complications and death,” the pediatrics group said.

If MMR vaccine rates went up by 5%, the country would see only about half as many measles cases in the next 25 years that it saw in the last 25.

The MMR vaccine is incredibly effective—roughly 97 percent of people are protected with two shots—but it’s not been tested in an environment where there are thousands of cases.

But the way forward is clear, experts say: The only thing that can end the spread of measles is the MMR vaccine, full stop.

But even after the first child’s death in February, RFK Jr. continued to question the MMR vaccine and tout therapies, like vitamin A, that are not preventive measures.