History, 18.07.2019 18:30, tristanlindor5908

In the 1950s, the polio virus paralyzed many children for life. today, polio has been reduced by 99 percent. which of the following has played the greatest role in reducing polio infections worldwide?

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History, 22.06.2019 01:10, krystlelong29

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In the 1950s, the polio virus paralyzed many children for life. today, polio has been reduced by 99...