Last seen in:
- Eugene Sheffer - King Feature Syndicate - Apr 16 2013
- New York Times - Aug 8 2012
- L.A. Times Daily - Jul 3 2012
- Eugene Sheffer - King Feature Syndicate - Jun 13 2011
- Eugene Sheffer - King Feature Syndicate - May 28 2010
- Eugene Sheffer - King Feature Syndicate - Aug 24 2007
- Eugene Sheffer - King Feature Syndicate - Mar 13 2004
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