cTn-I is significantly higher in FMD-positive < 2 months calves showing clinical signs suggestive of myocarditis (A1:11.65 ± 0.34) as compared to FMD-positive < 2 months and > 2 months < 4 months calves showing no clinical signs suggestive of myocarditis (A2: 0.06 ± 0.00, B1:0.052 ± 0.002). The gene discussed is TNNI3; the disease is myocarditis.