| Date | 1708 |
| Author | Leeuwenhoek |
| Contribution | Observed and reported microbes in "fur" scraped from human tongue during fever. |
| Reference | Dobel |
| Notes | In letter (in Dutch) of 29 June 1708; partial English translation published in same year. Dobel, 1932, said that these were "obviously putrefactive organisms," not normal inhabitants on the mouth. |
| Category | Miscellany |
| Pathogen Class | Protozoa |
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