| Date | 1822 |
| Author | Anon. |
| Contribution | French experts studied Yellow Fever outbreak in Barcelona. |
| Reference | McNeill |
| Notes | Concluded no possibility of contact between victims, therefore not contagious. Major blow to germ theory. Gave ammunition to British liberals who opposed quarantine as being suppression of free trade. McNeill - p. 266. |
| Category | Miscellany |
| Pathogen Class | General |
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