Your child can die from chickenpox.

One bacterium has 2,000 to 6,000 proteins.

When you're in the womb, you're in a sterile environment. When you enter the birth canal and the world, you're not. Very quickly, you have, living on the surface of your body, trillions of bacteria, literally trillion.

Physicians who care for adults generally don't think about vaccines as much as pediatricians do, and adults think of vaccines as a kid thing.

I've never seen this level of anger at parents who've chosen not to vaccinate their children.

Pneumococcus is a fairly common cause of pneumonia and [raises the] risk of death in older adults.

What really reinvigorated vaccines was Prevnar, the pneumococcal vaccine that prevents against meningitis and ear infections. Here was the first vaccine to cross the billion-dollar mark.