Medical Dictionary

XDR

abbreviation

medical Definition of XDR

extensively drug-resistant
  • No one knows the exact number of cases of the two types of drug-resistant TB, called MDR and XDR for multidrug-resistant and extensively drug-resistant.
  • —Donald G. McNeil Jr.The New York Times23 Mar. 2010
  • XDR tuberculosis is caused by a strain of Mycobacterium tuberculosis resistant to isoniazid and rifampin (which defines MDR tuberculosis) in addition to any fluoroquinolone and at least one of the three following injectable drugs: capreomycin, kanamycin, and amikacin.
  • —Mario C. Raviglione and Ian M. SmithThe New England Journal of Medicine15 Feb. 2007

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