| Date | 1892 |
| Author | Pfeiffer |
| Contribution | Isolated Hemophilus influenza (an agent of bacterial pneumonia). |
| Reference | Garrison |
| Notes | Garrison gives the date as 1892-93, and refers the agent as the "influenza bacillus" (presumably the explanation of the specific name). |
| Category | Causation |
| Pathogen Class | Bacteria |
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