| Rating | Solver | Clue |
|---|---|---|
| SERUM | Vaccine | |
| RETROVACCINATION | The inoculation of a cow with human vaccine virus. | |
| POCK | A pustule raised on the surface of the body in variolous and vaccine diseases. | |
| HUMANIZE | To convert into something human or belonging to man; as, to humanize vaccine lymph. | |
| VACCINE | Of or pertaining to cows; pertaining to, derived from, or caused by, vaccinia; as, vaccine virus; the vaccine disease. | |
| VACCINATE | To inoculate with the cowpox by means of a virus, called vaccine, taken either directly or indirectly from cows. | |
| POX | ...ny kind, but chiefly or wholly restricted to three or four diseases, -- the smallpox, the chicken pox, and the vaccine and the venereal diseases... | |