Last seen in:
- Eugene Sheffer - King Feature Syndicate - Feb 7 2024
- Eugene Sheffer - King Feature Syndicate - Feb 27 2021
- Universal - Aug 11 2020
- L.A. Times Daily - Jul 29 2019
- The Washington Post - Jul 29 2019
- USA Today - May 28 2019
- The Washington Post - Nov 2 2018
- L.A. Times Daily - Nov 2 2018
- Universal - Aug 25 2018
- The Washington Post - Nov 22 2017
Related Clues:
- Polio vaccine developer
- See 7-Down
- Kind of vaccine
- Oral vaccine developer
- Polio scientist
- Scientist who won a 1977 Presidential Medal of Freedom
- Vaccine developer Jonas
- Vaccine developer
- Sabin's rival
- Polio fighter
- Polio vaccine discoverer
- Inoculation innovator
- Polio conqueror
- Polio immunologist Jonas
- Famed polio fighter