With anti-vaccine activist Robert F. Kennedy Jr. in charge of the nation's biggest health agency, it wouldn't take much tampering to enable vaccine-preventable diseases to make a comeback.
That's the adjective used by the director of the U.S. Centers for Disease Control and Prevention's Global Immunization Division. Can the world bring this outbreak under control?
The first vaccine required for school was for smallpox, over 200 years ago. And for decades, all states have required that kids be vaccinated against contagious diseases like polio to attend school.
