The antibiotic era, begun by the discovery of streptomycin by Schatz and Waksman in the s and its use to treat TB and followed by the introduction of many other antibiotics like isoniazid, rifampin, and pyrazinamide that are useful against TB, has not eliminated the disease The smear is counterstained with methylene-blue or certain other dyes.
Culture of relevant clinical specimen se.
Other human pathogens belonging to the Mycobacterium genus include Mycobacterium avium which causes a TB-like disease especially prevalent in AIDS patients, and Mycobacterium leprae, the causative agent of leprosy.
Though routine testing is not recommended for low risk individuals, a cut off of greater than and equal to 15mm is used for those individuals.
If you are travelling to an area with a lot of TB, or are being constantly exposed to it, it may be reasonable. Morbidity, as measured by histopathology analyses, is important to characterize another class of M.
In one such study that analyzed the offspring of a mating between the relatively sensitive C3H mouse strain and the resistant B6 strain, a locus, sst1, was mapped that had a major effect on susceptibility to tuberculosis