title: The sputum gram stain.
mesh_terms: D005840:Gentian Violet; D006801:Humans; D010619:Phenazines; D012141:Respiratory Tract Infections / Q000382:microbiology*; D013183:Sputum / Q000382:microbiology*
chemical_list: C035863:Gram's stain; D010619:Phenazines; D005840:Gentian Violet