One good way to assess the great figures of medicine is by how completely they make us forget what we owe them. By that measure, Dr. Jonas E. Salk ranks very high. Partly because of the vaccine he introduced in the mid-1950s, it's hard now to recall the sheer terror that was once connected to the word polio. The incidence of the disease had risen sharply in the early part of this century, and every year brought the threat of another outbreak. Parents were haunted by the stories of children stricken suddenly by the telltale cramps and fever. Public swimming pools...
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