| Date | 1821 |
| Author | Bretonneau |
| Contribution | Presented oral reports on the specificity of diseases such as diphtheria and typhoid. |
| Reference | Bullock |
| Notes | A concept that was important ground work for development of the germ theory. Published in 1826-29. Bullock - p. 157. |
| Category | Miscellany |
| Pathogen Class | General |
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