I rarely get sick either, perhaps less than once a year, before and after EC. Patrickchao also mentioned that his wife has very 'strong' immune system, that she doesn't get sick even when the whole family is sick. Perhaps it's not whether or not how strong or weak the immune system is, but more of a immune system 'inbalance'?
By the way for those of you who are curious, Patrickchao posted an update of his wife current condition on the chinese forum a couple of days ago. He said no peelings on his wife's lips.