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Definitions by Ursus arctos horribilus

infectivist

Portmanteau word formed from infection and activist, used to describe someone who not only denies the scientific consensus on the safety and efficacy of immunisation but whose obsessive anti-vaxxer activism effectively makes them an advocate for infectious disease.
When asked why measles was sweeping the country after people stopped immunising their children after reading his anti-immunisation book, the infectivist bleated “fake news” and ended the interview.