Science, asked by amitbhaisahab, 4 months ago

How is polio vaccine is given currently and how was it given 20 years ago?​

Answers

Answered by zaresh1998
12

Answer:

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Explanation:

This vaccine was given as an oral preparation instead of as a shot. By 1963, this oral vaccine had been improved to include protection against all three strains of polio and was licensed as “trivalent oral poliovirus vac- cine” (tOPV).

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