Myocarditis is known to occur mainly in adults under the age of 50 [7] and so we examined the percentage of patients with these biomarkers that were ≤50 years of age which were as follows: troponin T (n = 5/7, 71.4%), troponin I (n = 2/9, 22.2%), BNP (n = 1/13, 7.7%), NT-proBNP (n = 13/29, 44.8%), CRP (n = 99/184, 53.8%), IL-6 (n = 50/84, 59.5%), creatine kinase/CK-MB (n = 8/14, 57.1%), D-dimer (n = 89/154, 57.8%), kappa immunoglobulin FLC (n = 3/4, 75.0%), and lambda immunoglobulin FLC (n = 5/7, 71.4%). Here, NPPB is linked to myocarditis.