Myocarditis has long been recognized as a complication of rheumatic fever, diphtheria, scarlet fever and whooping cough. It also occurs in association with poliomyelitis and more rarely with other virus infections such as influenza, mumps, psittacosis, infectious mononucleosis, primary atypical pneumonia, varicella, measles, infectious hepatitis and yellow fever (Lyon, 1956; Silber, 1958). Myoc...