| Date | 1898 |
| Author | Smith |
| Contribution | Showed that human and bovine tubercle bacilli were different strains of the same organism. |
| Reference | Lechevalier |
| Notes | Theobald Smith. Organisms appeared to be identical, but their differences in infectivity to various animals species was clear. This led Koch to the mistaken conclusion that the bovine infection was not transmissible to humans. This was of practical importance in relation to public health measures in the early years of the 20th Century. |
| Category | Miscellany |
| Pathogen Class | Bacteria |
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