| Date | 1829 |
| Author | Ehrenberg |
| Contribution | Began his study of microorganisms. |
| Reference | Doetsch |
| Notes | According to Cohn (1872). While this is in the nature of a biographical event, it is included because of the rarity and significance of such studies at this time. See 1830. |
| Category | Miscellany |
| Pathogen Class | Bacteria |
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