I think I have a dust allergy that makes me sneeze when I vacuum or move furniture but apart from that I've known my girlfriend for just over 3 years now and she said she's never seen me sick. It was probably 9 months before I met her, ~mid 2010, I remember having a kind of head cold from working somewhere with a walk in fridge room and industrial freezer. Then before that... I can't really remember. So no, I don't really get sick that often.