| Clue | Source | Date |
|---|---|---|
| Polio vaccine developer who died on June 23, 1995, at the age of 80 | ||
| Vaccine pioneer | Thomas Joseph | 23 Jun 2018 |
| Vaccine pioneer | Eugene Sheffer | 07 May 2018 |
| Polio vaccine developer | ||
| Eponymous bacteriologist | ||
| Eponymous bacteriologist | ||
| Scientist in the news, 4/55 |