| Date | 1865 |
| Author | Homan |
| Contribution | With Hartwig, traced transmission of typhoid. |
| Reference | Kobro |
| Notes | They developed epidemiological evidence for the spread of typhoid fever by itinerants in Norway. See Kobro, I., Annals of Medical History 7: 395, 1923 (cited in unpublished essay by P. F. Mange.) See 1859 Homan. |
| Category | Causation |
| Pathogen Class | General |
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