Two Doses of Chickenpox Vaccine Reduce Infection Rates

Two doses of chickenpox vaccine are better than one, new research confirms. After the introduction of the second dose of chickenpox vaccine, the rates of chickenpox infection dropped 76 percent and 67 percent at two U.S. sites tracked for the study on opposite sides of the country. Rates of infection in adults and infants -- two groups who generally don't receive the vaccine -- also went down. Read the full story