| Date | 1851 |
| Author | Bilharz |
| Contribution | Reported discovery of a dioecious trematode (Schistosoma) in portal blood of humans. |
| Reference | Garrison & Morton |
| Notes | T.M. Bilharz. In the following year he reported a similar worm associated with the urinary bladder. These reports were in the form of letters, and did not appear in the literature until 1852. |
| Category | Miscellany |
| Pathogen Class | Helminths |
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