TUBERCULOSIS
TUBERCULOSIS Etiology. Tuberculosis is a classical chronic specific granulomatous inflammation caused by Mycobacterium tuberculosis or Koch’s bacillus. R. Koch discovered this basillus in 1882. The organism has 5 distinct pathogenic strains: hominis, bovis, avium, murine, and cold-blooded vertebrate strain. The first two strains (hominis and bovis) are definitely infective