Extensively Drug-Resistant Tuberculosis, Central China, 2007–2009

摘要

To the Editor: Multidrug-resis-tant (MDR) tuberculosis (TB), defi ned as TB caused by Mycobacterium tuberculosis resistant to isoniazid and rifampin, is threatening global control of TB. The emergence of extensively drug-resistant (XDR) TB, defi ned as MDR TB resistant to at least 1 quinolone and 1 of 3 injectable second-line drugs (kanamycin, amikacin, or capreomyin), further jeopardizes TB control and prevention