Varicella vaccine from a child with natural varicella, introduced into human embryonic lung cell cultures, adapted to and propagated in embryonic guinea pig cell cultures, and finally propagated in human diploid cell cultures. Japan was among the first countries to vaccinate for chickenpox. The vaccine was first licensed in the United States in 1995. Routine vaccination against varicella zoster virus is also performed in the United States, and the incidence of chickenpox has been dramatically reduced there (from 4 million cases per year in the pre-vaccine era to approximately 400,000 cases per year as of 2005). In Europe most countries do not
Technical school Technical school In the United States, a technical school is a two-year college that covers fields such as business, finance, hospitality, tourism, construction, engineering, visual arts, information technology and community work. The Association for Career and Technical Education is the largest U.S. education association dedicated to promoting career and technical education for youth and adults. Technical school is also the term used in the United States Armed Forces for the job specific training given immediately after recruit training. Though similar to the training provided by a two-year college, the training is much more concise, eschewing any coursework outside the minimum