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Chickenpox (varicella) used to be very common in the United States before the chickenpox vaccine became available in 1995. In the early 1990s, an average of 4 million people got chickenpox, 10,500 to 13,000 were hospitalized (range, 8,000 to 18,000), and 100 to 150 died each year. Most of the severe complications and deaths from chickenpox occurred in people who were previously healthy. Each year, more than 3.5 million cases of varicella, 9,000 hospitalizations, and 100 deaths are prevented by varicella vaccination in the United States. For more information, see Monitoring the Impact Varicella Vaccination.

For surveillance and reporting information for health care professionals, see Conducting Varicella Surveillance.

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