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Chickenpox is not a reportable disease, so exact numbers are not available, but sampling centers for chickenpox prevalence shows that chickenpox cases in the US have dropped 90-95% since the start of immunization in the 1990s. Prior to the introduction of chickenpox vaccine in 1995, there were about 4 million cases per year. Now the rate is more like 200,000 to 400,000 cases per year. This rate is expected to drop further as more adults have been vaccinated.

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11y ago

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