title: [Refractory respiratory tract infections. 1. The defense mechanism of pulmonary alveolar airway. b. Humoral and cellular defense mechanisms].
mesh_terms: D000917:Antibody Formation; D006801:Humans; D007111:Immunity, Cellular; D007136:Immunoglobulins / Q000276:immunology; D007372:Interferons / Q000276:immunology; D007375:Interleukin-1 / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology; D008264:Macrophages / Q000276:immunology; D011650:Pulmonary Alveoli / Q000276:immunology*; D012141:Respiratory Tract Infections / Q000276:immunology*
chemical_list: D007136:Immunoglobulins; D007375:Interleukin-1; D007372:Interferons