| Date | 1878 |
| Author | Lewis |
| Contribution | Found trypanosomes in blood of rat. |
| Reference | Foster |
| Notes | The work, done in India, was influential because it was done in mammals, whereas previius reports of trypanosome had involved frogs. See Parasitology Today 9:348, 1993. |
| Category | Causation |
| Pathogen Class | Protozoa |
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