| Date | 1852 |
| Author | Snow |
| Contribution | Argued for germ causation of cholera. |
| Reference | Anon. |
| Notes | This was in the 2nd edition of his work on cholera, published two years before his demonstration of the role of water. Garrison gives 1849 (1st edition?). |
| Category | Causation |
| Pathogen Class | Bacteria |
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