I think that the tendency to get ANYTHING is genetic. Even stuff that is caused by a specific organism will be more apt to get you if you have the right genetics. Also, there is not much known about it.

My cardiac arrhythmia problem that I had was said to not be inherited. My grandfather had it. My mother and all my sisters had it. I had it. I found out years after the fact that my first cousin had it. My daughter has it. We were all treated with ablations and are doing much better. My point is, it is genetic.