The various stages of allergenic reaction is very useful because the only one i have ever been made really aware of is serious anapflactic shock-due to one our lads having a nut allergy and he must have all his one spoons, forks bowls etc. as if ther is minute traces of nuts he will become ill! I must say he very vigilant and i have only had administer his epi-pen once when he ate a food which had smalkll nut traces in but didn't say on the packet! BTW we consquesntly sewed them for negligence!!!!