| Date | 1865 |
| Author | Leuckart |
| Contribution | Showed that pinworm (Enterobius) infection resulted from swallowing eggs of the parasite. |
| Reference | Grove |
| Notes | Leuckart and three of his students swallowed pinworm eggs, and later recovered adult worms from their feces. (Published in 1867.) Note that Davaine, three years earlier, had shown that certain helminth ova hatched in the mammalian gut. |
| Category | Causation |
| Pathogen Class | Helminths |
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