Varicella (chicken pox)
Why From 1990 to 1994, before the vaccine became available, about 50 children died from chicken pox every year, and some developed severe infections of the skin, brain, or lungs.
When 12 to 15 months
Common Side Effects Pain, redness, or swelling at the injection site; mild fever; rash
Why This liver infection is spread primarily through contact with the feces of an infected person. About 100 people die from hepatitis A every year.
When Two doses are given at least three months apart between 12 and 23 months.
Common Side Effects Soreness, a feeling of warmth, or swelling at the injection site