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
Center for Scientific and Technical Creativity of the Youth subsidiaries of Komsomol "raikoms". The Centers enjoyed various benefits, including no taxes and only 3% contribution to the all-union fund. The fortunes of quite a few "new Russians", notably Mikhail Khodorkovsky arose from these Centers. The Centers continue to exist in modern Russia. Similar establishments were the Foundations of Youth Initiatives (фонды молодёжных инициатив, ФМИ). Center for Scientific and Technical Creativity of the Youth Centers for Scientific and Technical Creativity of the Youth , NTTM) were established in the late Soviet Union during "perestroika" as enterprises whose goal was commercialization of science and technology. Other translations of the Russian term