<prompt> All of the followoing non-mycobacterial microorganisms display acid fastness, EXCEPT:NocardiaFusobacterium nucleatumRhodococcusIsospora  <response>: Microorganisms other than mycobacteria that display some acid fastness includes Nocardia, Rhodococcus, Legionella micdadei, Protozoa Isospora and Cryptosporidium. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 1340 