| Date | 1841 |
| Author | Dujardin |
| Contribution | Published major treatise on micro-organisms. |
| Reference | Garrison & Morton |
| Notes | Provided an improved classification (compared to those of Müller in 1786 and Ehrenberg in 1838). His family Vibrioniens included the genera Bacterium, Vibrio and Spirillum-- all now considered bacteria. |
| Category | Miscellany |
| Pathogen Class | Bacteria |
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