I sayed healthy for almost all the winter even though I nursed an SO and 2 kids through constant colds, flu bugs and so on. Last month though I ended up getting strep and finally was taken down I did passit on to almost everyone else though.

edit: I'd also point out that since january my diet has gone somewhat down hill. I am still eating low to moderate carb, but having more processed foods and not keeping track of carbs or cals. That could have something to do with it.