| Clue | Source | Date |
|---|---|---|
| Something legally defined in the U.S. as affecting fewer than 200,000 people | New York Times | 15 Mar 2025 |
| Something that's not contracted very often | ||
| Something that's not contracted very often | New York Times | 24 Nov 2019 |
| Epidemiologist's focus, at times (XV, 7) |