title: Epidemiologic significance of primary resistance in Spain: refutation of the concept of transmission of resistant strains of mycobacterium tuberculosis.
mesh_terms: D004352:Drug Resistance, Microbial; D006801:Humans; D009169:Mycobacterium tuberculosis / Q000187:drug effects*; D013030:Spain; D014397:Tuberculosis, Pulmonary / Q000382:microbiology / Q000635:transmission*