Varicella vaccine were vaccinated as children were still protected from varicella." However, since only one out of five Japanese children were vaccinated, the annual exposure of these vaccinees to children with natural chickenpox boosted the vaccinees' immune system. In the United States, where universal varicella vaccination has been practiced, the majority of children no longer receive exogenous (outside) boosting, thus, their cell-mediated immunity to VZV (varicella zoster virus) wanes—necessitating booster chickenpox vaccinations. As time goes on, boosters may be necessary. Persons exposed to the virus after vaccine tend to experience milder cases of chickenpox. Catching "wild" chickenpox as a child has been
Disease mongering Disease mongering ] Disease mongering is a term for the practice of widening the diagnostic boundaries of illnesses and aggressively promoting their public awareness in order to expand the markets for treatment. Among the entities benefiting from selling and delivering treatments are pharmaceutical companies, physicians, alternative practitioners and other professional or consumer organizations. It is distinct from the promulgation of bogus or unrecognised diagnoses. The term “monger” has ancient roots, providing the basis for many common compound forms such as cheesemonger, fishmonger, and fleshmonger for those who peddle such wares respectively. “Disease mongering” as a label for the "invention" or