Health care gaps in the global burden of drug-resistant tuberculosis.

The drug-resistant tuberculosis (DR-TB) cascade-from estimated or incident cases to numbers successfully treated or disease-free survival-has long been characterised by sharp declines at each step in the cascade. The losses along the cascade vary across different settings, and the reasons why some countries have a higher burden of DR-TB are complex and multifactorial; broadly, weak health systems, inadequate financing and poverty all impact differential access to DR-TB care. Within a human rights framework that mandates the right to health and the right to benefit from scientific progress, the aim of this review is to focus on describing inequities in access to DR-TB care at critical points in the cascade.