Etiology · Mycobacteria M. tuberculosis &m, bovis M tuberculosis-90% of human disease M. avium, M intracellulare in AIDs -Atypical TB Bacilli aerobic, non motile, no toxins no spore. Mycolic acid wax in cell wall Carbol dye-Acid alcohol fast(AFB) MBBS project, Zhongshan HospitalMBBS project, Zhongshan Hospital Etiology • Mycobacteria — M. tuberculosis & M. bovis — M. tuberculosis-90% of human disease — M. avium, M.intracellulare in AIDS - Atypical TB • Bacilli, aerobic, non motile, no toxins, no spore. • Mycolic acid wax in cell wall • Carbol dye - Acid & alcohol fast (AFB)