| Date | 1851 |
| Author | Anon. |
| Contribution | Debated contagion vs. miasma, at the first International Health Conference. |
| Reference | Anon. |
| Notes | It was held in Paris and lasted six months. Delegates from twelve countries debated contagionism vs. miasmatism. This is a vivid indicator that, in the middle of the 19th Century, the germ theory had not yet become a significant factor in the medical establishment. |
| Category | Causation |
| Pathogen Class | General |
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