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?

Answers

Cooperaton. (Apex) ^-^


0 0
Only authorized users can leave an answer!
Can't find the answer?

If you are not satisfied with the answer or you can’t find one, then try to use the search above or find similar answers below.

Find similar answers


More questions