Chickenpox vaccine may increase shingles risk in young adults

Vaccinating one-year-olds against chickenpox could temporarily nearly double the incidence of shingles in the wider population, but in younger adults than previously thought. The effect occurs because vaccination reduces the likelihood of adults who experienced chickenpox as a child being re-exposed to the virus. Re-exposure boosts immunity to shingles, caused by the same virus, Varicella-zoster ["]