| Date | 1837 |
| Author | Gerhard |
| Contribution | Made definite separation of typhus and typhoid, getting it accepted at least in the United States. |
| Reference | Norman |
| Notes | Others had recognized one or other disease distinctly (e.g., Louis, 1829). Separation not widely accepted in England until work of Wm. Jenner in 1849. |
| Category | Miscellany |
| Pathogen Class | General |
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