Question

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

Answer 1

Answer:

The first inactivated polio vaccine (IPV) was produced by Salk using virus grown on monkey kidney cells and inactivated with formalin. In 1954, the inactivated vaccine was tested in a placebo-controlled trial, which enrolled 1.6 million children in Canada, Finland and the United States.

Explanation:

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Answer 2

Answer:

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Explanation:

The first inactivated polio vaccine (IPV) was produced by Salk using virus grown on monkey kidney cells and inactivated with formalin. In 1954, the inactivated vaccine was tested in a placebo-controlled trial, which enrolled 1.6 million children in Canada, Finland and the United States[13].