<prompt> Answer this question truthfullyWhat is the significance of acid-fast staining on Stool OP, and what does it indicate if oocysts are stained in this way?  <response>: <reason> Acid-fast staining is a laboratory technique used to identify microorganisms that have a waxy cell wall, such as Mycobacterium tuberculosis. If oocysts stain acid-fast on Stool OP, this is indicative of the presence of Cryptosporidium, a protozoan parasite that can cause diarrhea in humans. 