| Date | 1896 |
| Author | Widal |
| Contribution | Described an agglutination test for the clinical diagnosis of typhoid fever. |
| Reference | Lechevalier |
| Notes | The discovery became important in establishing disease causation by a specific organism. Shiga, for example, relied on it in incriminating Shigella (as it is now called) as the agent of bacillary dysentery. See 1889, 1897. |
| Category | Immunology |
| Pathogen Class | Bacteria |
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