Polio vaccine in India: Why did it take so long?
In the early 1950s, polio outbreaks caused more than 15,000 cases of paralysis each year. Around 1988, over 99 percent of cases were ...
Tag: US physician Jonas Salk
In the early 1950s, polio outbreaks caused more than 15,000 cases of paralysis each year. Around 1988, over 99 percent of cases were ...
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