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Multidrug-resistant tuberculosis (MDR-TB) and extensively resistant tuberculosis (XDR-TB) are present in most regions of the world and represent a serious threat to the control of tuberculosis. They usually result from errors somewhere along the chain of management of the disease that favoured the selection of resistant mutants, progressively replacing drug-sensitive strains and transmitted to further patients. The currently recommended strategies for the control of this serious situation is the rapid identification of drug-resistant strains, careful drug management of patients with second-line drugs and prevention of the transmission of mycobacteria to contacts. Optimal selection and number of drugs and duration of treatment are not clearly defined. Prevention of the creation of additional cases of MDR-TB is crucial.
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Jean-Pierre Zellweger (2015) studied this question.
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