DescriptionExtensively Drug-Resistant Tuberculosis (XDR TB) Diminishing Options for Treatment (5102295715).jpg
XDR TB occurs when a Mycobacterium tuberculosis strain is resistant to two of the most powerful first-line drugs, as well as key drugs of the second line regimen. XDR TB strains may also be resistant to additional drugs, greatly complicating therapy. Credit: NIAID
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