title: Letter: Pneumococcal antigen in sputum.
mesh_terms: D000942:Antigens, Bacterial / Q000302:isolation & purification*; D001991:Bronchitis / Q000276:immunology / Q000382:microbiology; D006801:Humans; D007122:Immunoelectrophoresis; D008722:Methods; D011018:Pneumonia, Pneumococcal / Q000276:immunology* / Q000382:microbiology; D013183:Sputum / Q000276:immunology* / Q000382:microbiology; D013296:Streptococcus pneumoniae / Q000276:immunology*
chemical_list: D000942:Antigens, Bacterial