Caption: Mumps is one childhood illness that can be prevented by a vaccine.

Think about a time when you felt sick. Most people get sick from time to time. In many cases, you can help keep yourself well by following good health habits.

Do you wash your hands before you eat? Do you know why you should? You should wash because your hands are probably covered with germs!

Centuries ago, people believed that evil spirits caused sickness. Today scientists know that many illnesses are caused by germs called bacteria and viruses.

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