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Definitions for drug-resistant tuberculosis[1,2]

Definitions for drug-resistant tuberculosis[1,2]
Drug-resistant TB An isolate of Mycobacterium tuberculosis with resistance to one or more antituberculous drugs.
Monoresistant TB An isolate of M. tuberculosis with resistance to a single antituberculous agent.
Polyresistant TB An isolate of M. tuberculosis with resistance to more than one antituberculous agent; the isolate may be resistant to either isoniazid or rifampin but not both.
Multidrug-resistant TB (MDR-TB) An isolate of M. tuberculosis with resistance to at least isoniazid and rifampin and possibly additional antituberculous agents.
Pre-extensively drug-resistant TB (pre-XDR-TB) An isolate of M. tuberculosis with resistance to isoniazid and rifampin as well as a fluoroquinolone (levofloxacin or moxifloxacin) OR resistance to isoniazid, rifampin, and at least one second-line injectable agent (amikacin, capreomycin, kanamycin).
Extensively drug-resistant TB (XDR-TB) An isolate of M. tuberculosis with resistance to isoniazid, rifampin, a fluoroquinolone (levofloxacin or moxifloxacin), and at least one second-line injectable agent (amikacin, capreomycin, kanamycin) OR resistance to isoniazid, rifampin, a fluoroquinolone, and either bedaquiline or linezolid.
Primary drug resistance Drug resistance in a patient who has never received antituberculous therapy.
Secondary drug resistance Development of resistance during or following antituberculous therapy in patients who had previously had drug-susceptible TB.
The above definitions are used by the United States Centers for Disease Control and Prevention (CDC)[2]. The CDC recognizes the World Health Organization (WHO) definitions; in addition, it also includes consideration of bedaquiline and linezolid susceptibility.
TB: tuberculosis.
References:
  1. Viney K, Linh NN, Gegia M, et al. New definitions of pre-extensively and extensively drug-resistant tuberculosis: update from the World Health Organization. Eur Respir J 2021; 57:2100361.
  2. Centers for Disease Control and Prevention. Surveillance definitions for extensively drug resistant (XDR) and pre-XDR tuberculosis. Available at: https://www.cdc.gov/tb/publications/letters/2022/surv-def-xdr.html (Accessed on March 24, 2022).
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