We have yet to have a good winter.
: DD2 wasn't a preemie but got pertussis as a brand newborn which let to chronic lung disease, she was O2 dependent for 6 months. That winter was really tough since the pertussis lasted so many months. We didn't take DD2 out at all, but 4y old DD1 went out some with other people, and would bring back sniffles, and influenza once, which of course DD2 got. I second the others that the flu was BAD, it set us back months with her. She got Synagis that winter. The next winter she turned 1 in Oct and it was rough again. She got RSV (she went back on O2 for it), pneumonia, croup, hand, foot, and mouth disease, chicken pox, many, many colds/coughs and stomach bugs. I did my best to keep her away from ill people, but DD1 was 5 by then and had things to go to and I no longer had help that could drive her around for me while I stayed home with DD2. She literally went no more then 2 weeks between illnesses from Sep until late June. She has already been ill three times since Sep 1st, we have only gone a couple days between bugs, so I'm not liking how this winter looks already.
On the plus side though, we haven't had to use nebs/inhalers so far this season....
We take precautions, everyone knows not to come around us if they have anything, no matter how slight it is. We use the antibacterial hand stuff while out, wash hands, eat heathy, try to take care of ourselves, I'm anal about making sure she gets enough sleep, but DD2 catches every single germ that she is exposed to no matter what I do.