My DH has never had a problem with beef before, but last Thursday I made a beef casserole with beef from the butchers, which we have not used before. The next morning he was covered in a hivey sort of rash, which looked really awful, but went away after a few hours. Last night we ate the leftovers of the casserole and he had the same sort of rash this morning, although not as bad. Could it be the beef, or is it more likely to be something else?