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Polio vaccine developer

Looking for the answer to the USA Today Crossword clue “Polio vaccine developer”? The solution is SALK, a 4-letter word. This clue was most recently seen in the June 20, 2026 (Saturday) USA Today Crossword. Tap any date below to open that day's complete puzzle, or search another clue from the bar above.

Answer
SALK

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