title: Letter: Pneumococcal antigen in sputum.
mesh_terms: D000942:Antigens, Bacterial / Q000302:isolation & purification*; D001991:Bronchitis / Q000175:diagnosis; D003937:Diagnosis, Differential; D006801:Humans; D007122:Immunoelectrophoresis; D011014:Pneumonia / Q000175:diagnosis / Q000276:immunology; D013183:Sputum / Q000276:immunology*; D013296:Streptococcus pneumoniae / Q000276:immunology*; D013997:Time Factors
chemical_list: D000942:Antigens, Bacterial