Cardiovascular disease is never going to be contagious, except through socially transmitted values that say it is okay to commit atrocity against cattle.
Some people might have said the same about cancer too
Edit: Forget cancer.
Viruses are one of the most common causes of heart inflammation. When an infection leads to myocarditis, health experts refer to it as infective myocarditis. Myocarditis can occur if the virus infects heart tissue. This can trigger an immune system reaction that may result in inflammation of heart muscle tissue