Polio has been a cause of life-threatening paralysis for thousands of years.At the height of the biggest-ever outbreak, in 1952, almost 60,000 cases with more than 3,000 deaths were reported in the US alone.A decades-long push to increase immunizations and access to clean water has meant that mass outbreaks, with hospital wards filled with children kept alive in iron lungs, are a distant memory.
#people #back #years #information #vaccination #governments #middle-east #afghanistan #transmission #asymptomatic
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