I'm not @cvjw, but I also thought your original post meant you'd had bronchitis 4x this year.
Ah. I see. No, I mentioned that I've had 3 colds in the last year but was sick again with what I thought was just another cold but then rapidly progressed into something more serious.
My vitamin d levels had dropped again at my last physical in November, so perhaps that's why I've been more susceptible this last year. I'm working to get that level back up.