"Nothing in nature that is not useful".  The anti-vaccination crusade and the idea of 'harmonia naturae' in Alfred Russel Wallace.
Scarpelli
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D000486:Allergy and Immunology / Q000266:history*; D005075:Biological Evolution; D049711:History, Modern 1601-; D011057:Politics; D012899:Smallpox / Q000266:history*; D006113:United Kingdom