| Date | 1868 |
| Author | Beale |
| Contribution | Opposed germ theory on ground that microbes may be found in the lungs and intestiines of healthy people. |
| Reference | Waller |
| Notes | Lionel Beale. It was not yet recognized that while some bacteria are pathogenic, others are not. |
| Category | Miscellany |
| Pathogen Class | Bacteria |
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