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.
Surveillance of chickenpox is important to. document and monitor the impact of the. varicella vaccination program on disease. incidence, morbidity and mortality; to. evaluate the effectiveness of prevention. strategies; and to evaluate vaccine. effectiveness under conditions of routine. use.