| Date | 1873 | 
| Author | Murchison | 
| Contribution | Traced a London typhoid outbreak to polluted milk, but did not accept germ theory of infection. | 
| Reference | Anon. | 
| Notes | See Snow 1854. Not in Lechevalier. | 
| Category | Causation | 
| Pathogen Class | Bacteria | 
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