| Date | 1860 |
| Author | Zenker |
| Contribution | Found overwhelming evidence that microscopic worms (Trichinella spiralis) caused fatal muscle disease in one case. |
| Reference | Grove |
| Notes | See Campbell, W. C. Trichinella and Trichinosis, Plenum, 1983. |
| Category | Causation |
| Pathogen Class | Helminths |
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