title: A WHO cooperative effort to isolate a species specific tuberculin for skin testing.
mesh_terms: D000818:Animals; D006168:Guinea Pigs; D008970:Molecular Weight; D011786:Quality Control; D013045:Species Specificity; D014373:Tuberculin / Q000276:immunology / Q000302:isolation & purification* / Q000592:standards; D014374:Tuberculin Test; D014944:World Health Organization
chemical_list: D014373:Tuberculin