| Date | 1871 |
| Author | Pasteur |
| Contribution | Began investigations on the fermentation responsible for the production of beer. |
| Reference | Geison |
| Notes | He continued to be involved in the broader issues of microbes and fermentation, and would not become involved in the microbial causation of disease of higher animals for another half dozen years. |
| Category | Miscellany |
| Pathogen Class | General |
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