| Date | 1837 |
| Author | Gerhard |
| Contribution | Distinguished between typhus and typhoid (such clinical refinement later becoming helpful in establishing the germ theory). |
| Reference | Garrison |
| Notes | W. W. Gerhard. Settled the difference in a way that was influential, at least in U.S.A. He was a pupil of P.C.A. Louis, who described typhoid in detail in 1829. |
| Category | Miscellany |
| Pathogen Class | Bacteria |
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