| Date | 1885 |
| Author | Mayer |
| Contribution | Demonstrated the contagiousness of tobacco mosaic disease. |
| Reference | Lechevalier |
| Notes | Adolph Mayer, had been working on the disease since 1879. Attempts to filter out bacteria (putative agent) were unsuccessful but no attempt was made to show infectivity of filtrate. Did not suspect a smaller class of pathogen. See |
| Category | Causation |
| Pathogen Class | Viruses |
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