Varicella zoster virus countries. Varicella vaccination has raised concerns in some that the immunity induced by the vaccine may not be lifelong, possibly leaving adults vulnerable to more severe disease as the immunity from their childhood immunization wanes. Vaccine coverage in the United States in the population recommended for vaccination is approaching 90%, with concomitant reductions in the incidence of varicella cases and hospitalizations and deaths due to VZV. So far, clinical data has proved that the vaccine is effective for over 10 years in preventing varicella infection in healthy individuals and when breakthrough infections do occur, illness is typically mild. In 2007,
Technical Aesthetics Soviet counterparts. It also rehabilitated the memory of movements such as Russian constructivism, which had been condemned by Stalin in favour of Socialist realism, even if they set the foundations of Russian design in the early 1920s. According to art historian Alexandra Chiriac, the term "technical aesthetics" was invented in Russia in the 1960s to speak about the field of design, which wasn't really developed in the country at the time, and which was promoted through the VNIITE research institute and the Technical Aesthetics magazine. Technical Aesthetics Technical Aesthetics (Техническая эстетика in Russian) was a monthly magazine produced in the