| Date | 1895 |
| Author | Denys |
| Contribution | With Leclef, showed that serum of an immunized animal enhanced the activity of phagocytes against the germs used as immunogens. |
| Reference | Anon. |
| Notes | Wright later named the serum substance opsonin. |
| Category | Immunology |
| Pathogen Class | Bacteria |
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