Interesting. Beachdoc, are you saying that even if the spores made contact with your skin, you would not get infected?<br><br>Under what conditions exist in a slaughterhouse that would put people at risk, but not pose a risk if released airborne?<br><br>About the whole flea market thing: yes, there is a lot of junk at flea markets. There is a lot of good quality stuff as well; it all depends on who you buy from. I check for airtight seals and no visual signs of damage. I've been able to find new, unused masks with seals still on the filters. I wouldn't discount it right off the bat, though.<br><br><br><br>Peace and God Bless America<br><br>Chris