Saidi A. Mohiddin et al.

Among the seemingly endless “unknown- unknowns” that the COVID era has foisted on policy makers, public health, health care providers, researchers, and the public is the apparently novel cardiac disease identified in this issue of the Journal of the American Heart Association (JAHA) as ”myocarditis after COVID-19 vaccination,” elsewhere as ”postvaccine myocarditis,” and perhaps in the future along the lines of ”vaccine-triggered, self-limiting, acute autoimmune myocarditis.” This potentially serious complication has been associated with serious harm, arguably most prominently through promotion of vaccine hesitancy, another complex mechanism underlying COVID19-mediated harm.