Anyone who has had a prolonged illness is more susceptible to viral attack. Not having a colon makes us more susceptible to the effects, because we dehydrate quicker, same as the elderly or small children. On top of that, there are more virulent strains of norovirus out there now.
An example is a few years ago my husband and I ordered the same meal in a restaurant. We both wound up with symptoms of food poisoning. He got over his in a day (and he even has UC). Mine went for 3 days, then I wound up with pouchitis that was persistent.
Jan