| Date | 1892 |
| Author | Welch |
| Contribution | Reported discovery of the bacterial agent of gas gangrene. |
| Reference | Ackermann |
| Notes | Clostridium perfringens Type A. Formerly C. welchii and Bacillus aerogenes capsulatus. |
| Category | Causation |
| Pathogen Class | Bacteria |
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