is_manufactured_by has function has role immunizes against disease immunizes recipient immunizes against pathogen has drug brand name smallpox Variola virus Homo sapiens Dryvax vaccine A vaccinia virus vaccine that is a freeze-dried calf lymph smallpox vaccine, specifically, Dryvax is a live-virus preparation of vaccinia prepared from calf lymph. Dryvax is a freeze-dried calf lymph smallpox vaccine. It is the world's oldest smallpox vaccine, created in the late 19th century by American Home Products, a predecessor of Wyeth. By the 1940s, Wyeth was the leading US manufacturer of the vaccine and the only manufacturer by the 1960s. After world health authorities declared smallpox had been eradicated from nature in 1980, Wyeth stopped making the vaccine. Dryvax vaccine Product Name: Smallpox Vaccine, Dried, Calf Lymph Type Oliver He http://en.wikipedia.org/wiki/Dryvax FDA licensed vaccine role USA licensed human vaccine vaccinia virus vaccine preventive vaccine function prophylactic vaccine licensed human smallpox virus vaccine Wyeth Pharmaceuticals Inc Dryvax