Like so many things with cancer treatment, experiences differ. The only infection I got during treatment was from myself - I had a persistent seroma and a pool of nice, nutrient rich fluid is heaven for the bad bugs we all have internally. Nothing else. But I agree, kid germs are shared with such ease and the adult always ends up being more sick than they are! I'm afraid you may just have to be particularly careful or distant if they are obviously germy. But you may find you are more resistant than you imagine. Best wishes.