"He's been getting treatment for normal TB for the last 4-5 months, but he's getting worse."

Tuberculosis (TB) is an infectious disease which kills 1.8 million people a year. In this vlog, a new patient arrives at the MSF TB clinic in Nairobi, and Mark explains how doctors diagnose multi-drug resistant TB - a form of tuberculosis which can't be cured with the medications most commonly used to treat it.