“…The histological similarity of lesions is not sufficient proof that the aetiological agents responsible for them are also similar. However, from the hearts of cases that would otherwise have been grouped as acute isolated myocarditis if included in this study, viruses of the Coxsackie group have been isolated (Gear, 1958;Babb, Stoneman, and Stern, 1961;Glajchen, -1961;Butler et al, 1962). It has not been possible to assess the percentage of cases of isolated myocarditis where attempts at virus isolation have met with failure; presumably they are not frequently reported.…”