| Date | 1893 |
| Author | Leuckart |
| Contribution | Reported (per Manson) the presence of adult worms (Onchocerca) in subcutaneous nodules of human. |
| Reference | Grove |
| Notes | O. volvulus. The microfilariae cause skin damage and "river blindness." |
| Category | Causation |
| Pathogen Class | Helminths |
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