| Date | 1650 |
| Author | Langius |
| Contribution | Allegedly espoused idea of invisible living things as cause of syphilis. |
| Reference | Kobler |
| Notes | Date arbitrary and tentative. Kobler (in The Reluctant Surgeon, Doubleday,1960) quotes Jean Astruc's account of beliefs that Christian Langius shared with Hauptmann. See Hauptmann. See Astruc. |
| Category | Causation |
| Pathogen Class | General |
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