| Date | 1846 |
| Author | Leidy |
| Contribution | Found Trichinella larvae in pork. |
| Reference | Campbell |
| Notes | Joseph Leidy. This discovery would have been of great importance had it not been dismissed by another authority as a larva of a different species. See Campbell, W. C. Bull. Hist. Med. 53: 520-552, 1979. See Campbell, W. C. Trichinella and Trichinosis. Plenum, 1983. |
| Category | Causation |
| Pathogen Class | Helminths |
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