Dad hadn't been able to drink beer(or so he thought) for almost 20 years, since a bad allergic reaction to an antibiotic....turns out he is allergic to LAGER yeast....I figured it he can eat bread, why would he be allergic to ALE yeast(same species). Took him a bottle of Blonde on Blonde...I guess the Chico strain(US-05) is OK for him any way.