| Date | 1899 |
| Author | Emmerich |
| Contribution | With Low, used by-product of bacterium (Pseudomonas) in attempt to alleviate diphtheria by immune enhancement. |
| Reference | Collard |
| Notes | They considered it an enzyme ("pyocyanase") acting through immune enhancement, not through bacterial antagonism. Also, treatment of wound infection. |
| Category | Immunology |
| Pathogen Class | Bacteria |
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