I first picked up I Theatres of Contagion i in March 2020, following the theatre closures during the initial COVID-19 lockdown, with questions on the future of touch in immersive theatre and performance works. In Part 2, Kirsten Shepherd-Barr considers the ways in which nineteenth-century theatre borrowed and adapted scientific notions of heredity and, in turn, how this adaptation blurred notions of social and viral contagion.