Author:
Collins C. H.,Yates M. D.,Grange J. M.
Abstract
SUMMARYVirulent strains of Mycobacterium tuberculosis isolated from humans are divisible into five variants by using four tests: oxygen requirement (aerobic or microaerophilic), nitrate reductase activity, susceptibility to pyrazinamide (60 μg/ml) and susceptibility to thiophene-2-carboxylic acid hydrazide (5 μg/ml). The five variants are referred to as Classical human, Asian human, bovine, African I and African II. The relation of these variants to previously described types is discussed. This simple division has been shown to be useful in epidemiological studies.
Publisher
Cambridge University Press (CUP)
Subject
Public Health, Environmental and Occupational Health,Immunology
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