All cases of paralytic polio acquired in the U.S. between 1980 and 1999 were caused by Salk's polio vaccine.

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Quizplus · Accepted Answer

This statement is false. According to the Centers for Disease Control and Prevention (CDC), the last case of paralytic polio in the United States caused by wild poliovirus (not the vaccine) occurred in 1979. The Salk polio vaccine has been used successfully to control and eliminate polio in many parts of the world.

All Cases of Paralytic Polio Acquired in the U