Meeting Report 27-29 October 2020 The overall goal of the meeting was to discuss recent changes in treatment regimens and diagnostics for drug-resistant TB and to determine how these impact on the definition of XDR-TB, with a view to revising this definition. The pre-existing definition of XDR-TB was formulated in 2006 at a meeting of the Global Taskforce on XDR-TB, convened by WHO, and has been in use for clinical and surveillance purposes, since this time.