"Again, I don't want to give advice," Kennedy said. "I can tell you, in Europe, they don't use the chickenpox vaccine ...

In the 1990s, hepatitis B and varicella (chicken pox) vaccines were added ... and multiple doses required for most vaccines, the vaccine schedule has become very complicated.

The use of other key vaccines in the childhood immunization schedule has decreased too ... and varicella, or chickenpox vaccines, all declined in more than 30 states last year compared with ...