>>I would be critical about the allergist's assertion.  

I am.  I am anaphylactic to natural rubber latex.  If a raw food is handled 
with gloves I can't eat it, but if the food is then cooked well I can because 
the protein is denatured.  I had just never heard of this happening with 
milk.  But it does seem to be the only answer I have to the why of what has 
happened.  

I just had a thought.  My son was skin tested years ago for milk, but I have 
seen discussion of being allergic to casein or whey or both.  Perhaps this is 
the answer here.  Can they test to see which protein it is that he is 
allergic to?  Can we do this with a RAST?  

E.J.