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

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.

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

Your child can die from chickenpox.

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.

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.