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Description ***”The vaccine consists of lyophilized calf lymph containing VACV prepared from live calves. The animals were infected by scarification, and the skin containing viral lesions was physically removed by scraping. The lyophilized calf lymph type vaccine is reconstituted with a diluent containing 50% glycerin, 0.25% phenol, and 0.005% brilliant green. Vaccine prepared by this traditional manufacturing technique of harvesting VACV from the skin of cows (and sheep) was used in most regions of the world during the smallpox eradication campaign. The facilities, expertise, and infrastructure required for producing the virus in this way are no longer available.” This image was provided by the Centers for Disease Control and Prevention.
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