MyocarditisCoxsackievirus InfectionsEnterovirus B, HumanAutoimmune DiseasesMyocardiumEnterovirus InfectionsCardiomyopathy, DilatedChagas CardiomyopathyEnterovirusAcute DiseaseCardiovirus InfectionsEncephalomyocarditis virusRats, Inbred LewCardiac MyosinsEndocardiumBiopsyReoviridae InfectionsPericarditisMyosinsVirus DiseasesHeartCardiomyopathiesGiant CellsEdema, CardiacMice, Inbred BALB CDisease Models, AnimalTrypanosoma cruziParvovirus B19, HumanFatal Outcome