The childhood varicella vaccine was introduced in the United States in 1995, so people born from that time on are the first group to reach adulthood with the vaccine’s protection against chickenpox. Additionally, those vaccinated against chickenpox carry a lower risk of later developing shingles caused by the reactivation of the varicella-zoster virus. A new study of more than 85 million U.S. adults found substantial differences in shingles diagnoses across birth cohorts, with the sharpest …
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