No cure exists for polio but it can be prevented with a vaccine. In 1954 a massive polio vaccine trial was initiated and 1.3 million children were vaccinated. The vaccine was so effective in this trial that it was made widely available to all children. By 1994 polio was considered eliminated (meaning no longer present in a specific geographical area) in the Americas. A three-year old boy from Peru was considered the last known case (Figure 1).
Module 4 Reading 1
Courtesy of the Pan American Health Organization and World Health Organization
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