<prompt> Which of the following stains positive with modified AFB stain?Bacilus anthraxCorynebacterium diphtheriaeCryptosporidium parvumActinomycetes  <response>: Ans. c Cryptosporidium parvum Ref. Ananthanarayan microbiology 6th ed. 371; Harsh Mohan Pathology 4th ed., 32ACID FAST STAINING IS POSITIVE WITH- Mycobacterium tuberculosis Mycobacterium leprae Nocardia Cyclospora Cryptosporidium parvum Modified AFB stain Isospora Modified AFB stain Bacterial spores Lipofuschin pigment Rodococcus equi- Lipofuschin is wear and tear lipid pigment in cells and can be stained by fat stains but differs from other lipids in being fluorescent and acid fast.- Acid fastness of tubercle bacillus is a scribed to the presence in the bacillus of an unsaponifiable wax Mycolic add or to a semi-permeable membrane around the cell. It is related to integrity of the cell and appears to be a property of lipid-rich waxy cell wall. 