Classification of diseases and their aetiological agents, with examples
| Disease | |||
|---|---|---|---|
| Monothetic definition* | Polythetic definition* | ||
| *On the basis of clinical signs and symptoms only. | |||
| Monothetic definition | Smallpox | Tuberculosis | |
| (group 1) | (group 2) | ||
| Agent (s) | |||
| Polythetic definition | Lung cancer | Bulimia and anorexia | |
| (group 3) | (group 4) | ||