[fifty five] Mycobacteria have an outer membrane lipid bilayer.[fifty six] If a Gram stain is carried out, MTB either stains extremely weakly "Gram-optimistic" or won't retain dye due to the large lipid and mycolic acid https://rorygvhy363304.theideasblog.com/28736517/5-simple-statements-about-stages-of-tb-explained