[How do immune cells react to pathogen invasion?].
D000818:Animals; D001424:Bacterial Infections / Q000276:immunology*; D003713:Dendritic Cells / Q000276:immunology; D006801:Humans; D007111:Immunity, Cellular / Q000276:immunology*; D008213:Lymphocyte Activation / Q000276:immunology; D051379:Mice; D013601:T-Lymphocytes / Q000276:immunology; D014777:Virus Diseases / Q000276:immunology*