i doubt you exchange bodily fluids with 1000s of people around you. maybe some, but not 1000s. AC and recycled air, on the other hand, are completely devoid of

i doubt you exchange bodily fluids with 1000s of people around you. maybe some, but not 1000s. AC and recycled air, on the other hand, are completely devoid of microorganisms that travel through the air. allergies is a north american thing, virtually unknown to other parts of the world. EDIT: AC and the recycled air is the actual point of this comment. fluids was the joke, apologies to offended. north america breathes AC recycled air. no one else does. at least not to this extent. at the same time, one of the standard conversation topics amongst immigrants (to NA) is "wtf does everyone here have allergies and what are they anyway?". until they develop their own after living here for a number of years.