| Date | 1872 |
| Author | Cohn |
| Contribution | Published book on bacteria, one of his many contributions to bacteriology. |
| Reference | Doetsch |
| Notes | Argued that bacteria could be classified into genera and species, based provisionally on morphology (at the species level) but open to the use of other characteristics. |
| Category | Miscellany |
| Pathogen Class | Bacteria |
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