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“Shared psychosis”—which is also called “folie à millions” [“madness for millions”] when occurring at the national level or “induced delusions”—refers to the infectiousness of severe symptoms that goes beyond ordinary group psychology. When a highly symptomatic individual is placed in an influential position, the person’s symptoms can spread through the population through emotional bonds, heightening existing pathologies and inducing delusions, paranoia and propensity for violence—even in previously healthy individuals. The treatment is removal of exposure.