Health Secretary Robert F. Kennedy Jr.'s Centers for Disease Control and Prevention has launched an unprecedented review of routine shots given to kids, alarming public health experts.

The word itself predates Christianity, but the conclave with its secretive deliberations and ancient trappings still captures the public's curiosity.

Measles is an extremely contagious disease. It's also extremely preventable. There's a vaccine. It's highly effective. For decades it has made measles outbreaks in the U.S. relatively rare, and measles…