| Clue | Source | Date |
|---|---|---|
| The cold will be so productive for infection fighting in the body (5,5,5) | ||
| Leukocytes | New York Times | 16 Nov 2018 |
| Leukocytes | ||
| They digest bacteria | USA Today | 02 Jan 2015 |
| They digest bacteria | ||
| Part of the body's defense system | ||
| Important parts of the body's defense system | ||
| Infection fighters | ||
| Immune system stuff |