Transient myocardial thickening associated with acute myocardial injury and congestive heart failure in two -positive cats

Case series summary In this report, we provide detailed clinical, laboratory, electrocardiographic and echocardiographic descriptions of two Toxoplasma gondii -positive cats diagnosed with transient myocardial thickening (TMT) and acute myocardial injury (MI). In both cases, aetiological diagnosis was based on the antibody screening test (all cats had IgM titres ⩾1:64) and MI was demonstrated by a concomitant severe increase of the serum concentration of cardiac troponin I (5.1–23.6 ng/ml; upper hospital limit