The burden of tuberculosis (TB) is a major impediment to
improved health for the world’s population.1– Increasing
global TB rates led the World Health Organization (WHO) to declare TB a
global emergency in 1993. Global TB control efforts, however, are
seriously threatened by increasing rates of drug-resistant
TB.2 The treatment of TB patients who have drug-resistant
strains is exceedingly costly, difficult, and less effective.