Oddly, I have had the complete opposite experience. Back in the US, before moving to the UK, I would have a terrible chest cold pretty much every year. When I first moved here, I was dreading my first one around my husband, because he's rather protective of me, and I was afraid I'd freak him out... it's been over 6 years, and I still haven't had more than sniffles. It's going to happen, but so far I've been fine. (We have mould.)