__________discovered the vaccine for polio.
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Answer:
An inactivated (killed) polio vaccine (IPV) developed by Dr. Jonas Salk and first used in 1955, and. A live attenuated (weakened) oral polio vaccine (OPV) developed by Dr. Albert Sabin and first used in 1961.
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Answer:
Dr. Jonas Salk
Explanation:
Salk worked incessantly for two-and-a-half years. Salk's inactivated polio vaccine was the first vaccine for the disease; it came into use in 1955.
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