| Date | 1884 |
| Author | Fraenkel |
| Contribution | Discovered agent of pneumonia. |
| Reference | Garrison |
| Notes | Similar or related discoveries made by Pasteur, Sernberg and Friedlander. Several bacterial species later shown to be involved, including species of the genera Streptococcus, Staphylococcus, Hemophilus, Klebsiella. |
| Category | Causation |
| Pathogen Class | Bacteria |
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