The first couple of sips trigger sneezes. Then I'm fine. I wouldnt call it an allergy (at least not for me). I think its something in the aroma when I hold the glass up to take a sip. Or maybe something to do with the texture of the wine in my mouth and how it affects my nerves. I dont know. Seems to happen with a shiraz more than a merlot.
Weird, huh?