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.
One dose of varicella vaccine (in children up to 13 years of age) will prevent varicella in. approximately 80â85% of cases. The vaccine effectiveness against severe varicella. (defined as >500 lesions) is greater at approximately 95â98%.