It seems like the greatest danger for people with severe allergies is the ignorance of others who don't have them. Most people have heard of peanut allergies because the allergen can be transferred without direct contact, but there are many other allergens that can be fatal as well. Please label what you are making; there may be allergies you haven't heard of. It doesn't need to be a big old warning - just a "contains" list. People with severe allergies are smart enough to check and will love you for the respect shown in doing it.
hugs,
charlotte