From the Globe and Mail:
Until recently, researchers thought that multidrug-resistant tuberculosis, or MDR TB, was as bad as the disease got.
They were wrong.
In 2005, doctors in South Africa discovered a new strain of the disease. Extremely drug-resistant tuberculosis - or XDR TB - was found to withstand all of the front-line drugs in the tuberculosis treatment arsenal.
Officials in Canada and the United States are searching for passengers who may have travelled with a U.S. man infected with XDR TB on two transatlantic flights this month. ...more
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