Vaccine pioneer

This time we are looking on the crossword clue for: Vaccine pioneer.
it’s A 15 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: SALK, SABIN, PASTEUR, JONASSALK.

Last seen on: –Thomas Joseph – King Feature Syndicate Crossword – Mar 19 2020
Thomas Joseph – King Feature Syndicate Crossword – Jun 5 2019