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

Huh. Turns out heart failure can be contagious.