| Date | 1873 |
| Author | Klebs |
| Contribution | Described a germ, Microsporon diphtheriticum, as causative agent of diphtheria. |
| Reference | Anon. |
| Notes | But later rejected this germ (fungus turning into coccus) in favor of a bacillus. See 1883. |
| Category | Causation |
| Pathogen Class | Bacteria |
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