| Date | 1855 |
| Author | Pollander |
| Contribution | Reported micro-organisms in blood, and especially spleen, of cows dead of anthrax. |
| Reference | Norman |
| Notes | Claimed to have made the observation in 1849. Measured and stained the "rods." He was uncertain of origin or nature, but considered the possibility that they were "products" of putrefaction and that they were contagious. |
| Category | Causation |
| Pathogen Class | Bacteria |
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