My personal answer to this question is a resounding YES! I have just passed the first winter of my life without getting sick. No colds, no flu, no grippe, no nothing. For the first time in my entire life,
I can hardly believe it. It's as if I were reborn. I took being sick in winter for granted. Now I see that it was due to my weakened immune system, from to its continuous fight with hep-c, that caused me to be so susceptible to other viruses.
Here's a positive side seffect to offset some of the negative ones.