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.

Flu vaccine is far and away the most underutilized.

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

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

Today, however, anti-vaccine activists go out of their way to claim that they are not anti-vaccine; they’re pro-vaccine. They just want vaccines to be safer. This is a much softer, less radical, more tolerable message, allowing them greater access to the media. However, because anti-vaccine activists today define safe as free from side effects such as autism, learning disabilities, attention deficit disorder, multiple sclerosis, diabetes, strokes, heart attacks, and blood clots—conditions that aren’t caused by vaccines—safer vaccines, using their definition, can never be made.

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.