Cefoxitin Piperacillin Penicillin
2.5. GENUS: MYCOBACTERIA Characteristics:
Non-spore forming, non-motile, aerobic, Acid-fast bacilli.
Acid-fastness depends on the waxy envelope-mycolic acid
of cell wall.
More resistant to chemical agents than other bacteria.
Once stained with primary stain, they resist decolorization by
• acid-alcohol. All bacteria Mycobacteria. . Mycobacteria of medical importance: M. tuberculosis M. leprae are decolorized
Mycobacterium tuberculosis Characteristics:
. Strictly aerobic acid-fast bacilli. . The main reservoir is an infected human. Antigenic structure:
Lipids: Mycolic acid, waxes, phosphatides .responsible for acid-fastness, granuloma formation and caseation necrosis.