Contagion is more than an epidemiological fact. The medical usage of the term is no more and no less metaphorical than in the entire history of explanations of how beliefs circulate in social interactions. The circulation of such communicable diseases and the circulation of ideas are both material and experiential. Diseases and ideas expose the power and danger of bodies in contact, as well as the fragility and tenacity of social bonds. In the case of the theatre, various tropes of contagion are to be found in both the fictional world on the stage (at least since Sophocles’ Oedipus Rex) and in many theories defining the rules of interaction between theatre audiences, fictitious characters and/or performers. In consequence, the historically ...