"I used to look at a beam of light with the motes of dust in it and think it was aesthetically pleasing," said Melissa R. Mazan, DVM, Dipl. ACVIM, of the Tufts University School of Veterinary Medicine in Massachusetts. "Now that I know what's in those dust motes, the pleasure is gone." Mazan described air quality testing in the equine barn at the 52nd annual American Association of Equine

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