| Date | 1900 |
| Author | Ehrlich |
| Contribution | Revised the theoretical basis of immuno-serology. |
| Reference | Anon. |
| Notes | He introduced the term "complement" for the heat-labile factor in serum that is necessary for germicidal and hemolytic reactions (see 1893, 1898) and provided the groundwork for the development of the "complement fixation test" by Bordet and Gengou a few years later. |
| Category | Immunology |
| Pathogen Class | General |
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