No. I don't think it would be connected with bipolar. I suggest you talk to your doctor about what you can do to beef up your immune system.
That said, though, come to think of it, I do take Tegretol as a mood stabilizer, and it weakens the immune system. So maybe a bipolar med might be involved.
I try not to get too close to ailing people, wash my hands very frequently, keep my hands away from my face, etc.