The Centers for Disease Control and Prevention (CDC) is working with other partners on an investigation involving a US citizen recently diagnosed with extensively drug-resistant tuberculosis (XDR TB). XDR TB has been recently defined as a subtype of multidrug-resistant tuberculosis with additional resistance to the two most important second-line antibiotics in addition to the two most important first-line drugs. CDC learned that a patient with XDR TB traveled to Europe via commercial airline and returned to the US via Canada.
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