All of the followoing non-mycobacterial microorganisms display acid fastness, EXCEPT:: (A) Nocardia, (B) Fusobacterium nucleatum, (C) Rhodococcus, (D) Isospora
Answer is B. 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