<prompt> Answer this question truthfullyWhat microorganisms can be stained using the Ziehl-Neelsen stain?  <response>: <reason> The Ziehl-Neelsen stain is a type of acid-fast stain that is used to identify acid-fast bacteria, such as mycobacterium e.g. TB, leprosy and Nocardia. It can also be used to stain the oocysts of the protozoan parasite Cryptosporidium. 