The increasing public health threat posed by substandard tuberculosis treatments purchased from pharmacies in poor countries could be mitigated if World Health Organization standards are enforced by governments, according to a study published online by PLoS Medicine. An insufficient dose of the drug's active ingredient actually promotes the growth of drug-resistant strains. Researcher Dr. Amir Attaran said the WHO regimen is not followed by all countries and its treatments are not prescribed by all doctors.

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