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Varicella virus vaccine live (1999 process) is a live attenuated virus vaccine derived from the Oka strain of the varicella-zoster virus (VZV). Developed by Merck, this specific "1999 process" version refers to a manufacturing modification approved by the FDA to optimize the production, potency, and stability of the vaccine, marketed under the brand name Varivax. It is indicated for active immunization to prevent chickenpox in individuals aged 12 months and older. The vaccine works by mimicking a natural infection to elicit a protective immune response, including both humoral (antibody) and cell-mediated immunity, without causing significant disease in healthy individuals. The 1999 process was a critical regulatory milestone that ensured consistent manufacturing standards for the first varicella vaccine approved in the United States.
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