| Date | 1889 |
| Author | Smith |
| Contribution | Observed intra-erythrocytic protozoan parasites in a case of Texas Cattle Fever. |
| Reference | Foster |
| Notes | Theobald Smith published his great work on this protozoan parasite in 1893 (q.v.). According to Foster (1965) he found the organism in 1889, the year he started work on the disease. See Parasitology Today 9:348, 1993. See 1888 Babes. See 1892 Smith. |
| Category | Causation |
| Pathogen Class | Protozoa |
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