title: Immunologic defence mechanisms.
mesh_terms: D000818:Animals; D006801:Humans; D007071:Immunoglobulin A, Secretory / Q000032:analysis / Q000502:physiology; D008168:Lung / Q000276:immunology*; D008214:Lymphocytes / Q000276:immunology; D008264:Macrophages / Q000276:immunology; D011650:Pulmonary Alveoli / Q000166:cytology / Q000276:immunology; D051381:Rats; D012141:Respiratory Tract Infections / Q000276:immunology
chemical_list: D007071:Immunoglobulin A, Secretory