This is a bit scary. A fly tying allergy possibility is much more common than I thought. When the sneeze attack occurred, I was making dubbing from zonker strips in a coffee grinder. I will go “back to the bench” to see if I react again to the rabbit fur. I was also using marabou and that can be really fluffy too. The search for the cause will continue and I am not going to give up tying and let the dust collect on the bench.
caribe