| Date | 1887 |
| Author | Weichselbaum |
| Contribution | Reported novel type of bacterium in post-mortum material from the brains of cases of cerebrospinal meningitis. |
| Reference | Garrison |
| Notes | He named it "Diplococcus intracellular meningitis" and showed it to be lethal in animals. |
| Category | Causation |
| Pathogen Class | Bacteria |
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