| Date | 1892 |
| Author | Koch |
| Contribution | Demonstrated the value of water filtration in the control of cholera. |
| Reference | Brock |
| Notes | The cholera outbreak in Hamburg in 1892 provided the context and motive for Koch and his students to show the efficacy of sand fitration in removing bacteria from water. (It was later determined that chlorination was even more effective in sanitizing urban water supplies.) |
| Category | Miscellany |
| Pathogen Class | Bacteria |
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