Last appearing in the Eugene Sheffer puzzle on February 27, 21 this clue has a 4 letters answer. Polio vaccine pioneer has also appeared in 3 other occasions according to our records.
Below you will find the answer to the clue but if it doesn't fit please feel free to contact us directly or write a comment to discuss it.
| S | A | L | K |
| Puzzle | Solution |
|---|---|
| Universal August 11 2020 | SALK |
| LA Times July 29 2019 | SABIN |
| USA Today May 28 2019 | SALK |
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