How common is anaphylaxis shock with aminoglycoside?

Rare: Its very uncommon, but possible.

Very uncommon.: Quite uncommon. In my 25 years of allergy-immunologly training I have seen/heard of it occurring about 2-4 times. Also, i believe in the distant past i read about a case of an aminoglycocide causing "red man syndrome" when it was administered rapidly, a non specific erythematous rash/flush which is not allergic but can be decreased by slowing down the infusion.