Polio 101: Signs, symptoms and dangers of an ancient virus

Polio 101: Signs, symptoms and dangers of an ancient virus

Striking children younger than 5 the hardest, the worst form of the virus causes nerve injury that can lead to paralysis, difficulty breathing and death. During 20th century epidemics, the virus often struck in warm summer months, sweeping through towns and cities every year or so. Polio was one of the world’s most feared diseases …

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