Myocarditis is also an inflammatory disease of the myocardium. Common causes are viral infections, such as Coxsackievirus B, Parvovirus B19, Human Herpesvirus 6, and Poliovirus, with Coxsackievirus B being the most common cause, accounting for about 30%-50%. Bacteria, fungi, spirochetes, rickettsiae, and protozoa can also cause myocarditis, but they are relatively rare. Non-infectious causes of myocarditis include drugs, radiation, connective tissue diseases, vasculitis, giant cell myocarditis, among others. These are all causes of myocarditis.