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

If you've had a cough that lasted weeks, a cough that just doesn't seem to go away, chances are it was pertussis.

For most mothers, vaccinations become a matter of faith - faith in pharmaceutical companies, faith in public health officials - and I think there's been an erosion of faith.

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.

People are reticent to give a newborn the hepatitis B vaccine and often delay it.

Pertussis is a disease that adolescents and adults give to children.