| Date | 1866 |
| Author | Griesinger |
| Contribution | Showed that hookworm is a cause of disease in humans. |
| Reference | Grove |
| Notes | The Old-world hookworm, Ancylostoma duodenale, had been discovered 23 years earlier (see Dubini) but had not hitherto been considered a pathogen. |
| Category | Causation |
| Pathogen Class | Helminths |
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