| Date | 1858 |
| Author | Hoegh |
| Contribution | Concluded that leprosy is contagious not hereditary. |
| Reference | Mange |
| Notes | This was based on study of the Leprosy Registry in Norway, see 1856. Hansen also came to consider the Registry evidence conclusive. (Unpublished essay by P. F. Mange.) |
| Category | Causation |
| Pathogen Class | Bacteria |
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