CRP and viral infectious disease: Patients with abnormal CRP more frequently had a presumed viral infection in the 6 months preceding diagnosis (55% vs. 28%, p < 0.001), chest pain (60% vs. 42%, p < 0.001), clinically suspected myocarditis (74% vs. 26%, p < 0.001) and higher mean troponin I levels (6140 ng/L vs. 1150 ng/L, p < 0.001).