| Date | 1840 |
| Author | Henle |
| Contribution | Propounded a persuasive germ theory but failed to find germs. |
| Reference | Garrison & Morton |
| Notes | Jacob Henle. Well-known teacher of Koch and progenitor of his Postulates. Cited Bassi. The epidemiologist Major Greenwood was among those who considered this contribution to be of the utmost importance; see note section of the Fracastoro entry. |
| Category | Causation |
| Pathogen Class | General |
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