Today the deadly and debilitating poliomyelitis virus is only endemic in four countries—Afghanistan, India, Nigeria, and Pakistan. This is- thanks to the groundbreaking research undertaken by U.S. medic and biologist Jonas Salk (1914-1995).
In 1947, at the University of Pittsburgh, SaIk combined his work on the influenza vaccine with searching for a vaccine to protect against polio. The virus was deadly in 5 to 10 percent of cases where patients became paralyzed, and thus were unable to breathe. Medical opinion at the time held that only a live virus could prompt complete immunity, but Salk disproved this. In 1952 he used formaldehyde to inactivate the polio virus and developed a vaccine still capable of triggering an immune response in a host. Initially tested on monkeys, then patients at the D. T. Watson Home for Crippled Children, Salk's success convinced him to test it on himself, his family, his staff, and
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