| Date | 1854 |
| Author | Cohn |
| Contribution | Published book on microscopic algae & fungi; proposed that bacteria (Vibrionia) be classified as plants instead of animals. |
| Reference | Lechevalier |
| Notes | Ferdinand Cohn's book was a major influence. He became leading authority on bacteria, and was consulted by Koch at a crucial time in the history of germ theory (1876). |
| Category | Miscellany |
| Pathogen Class | Bacteria |
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