A gemstone is any rock or mineral that could be used for ornamentation or jewelry. Gemstones usually are minerals prized for their color, beauty, rarity, and endurance. Most often, the minerals are cut and polished to bring out the natural beauty of the piece.
The varicella vaccine is a live (attenuated) virus administered to protect against the viral disease commonly known as chickenpox caused by the varicella zoster virus (VZV).he varicella vaccine is marketed as Varivax in the U.S. by Merck and globally as Varilrix by GlaxoSmithKline.
The researchers aimed to examine the long-term effectiveness of the vaccine and its influence on the epidemiology of varicella (chickenpox) and herpes zoster (shingles). Additionally, they looked at the results of a second dose of varicella vaccine, which became available in 2006.