| Date | 1888 |
| Author | Babes |
| Contribution | Reported a parasite in erythrocytes of cattle with disease (babesiosis). |
| Reference | Foster |
| Notes | Discovery made independently of Theobald Smith. Foster contends that the work of Babes "was of no significance in the development of our understanding of the disease." |
| Category | Causation |
| Pathogen Class | Protozoa |
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