title: Host defence mechanisms.
mesh_terms: D000920:Antibody-Dependent Cell Cytotoxicity; D001402:B-Lymphocytes / Q000276:immunology; D001424:Bacterial Infections / Q000276:immunology*; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology; D018805:Sepsis / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology