title: "Spontaneous" lymphocyte reactivity in the presence of virus infection.
mesh_terms: D000818:Animals; D006168:Guinea Pigs; D006801:Humans; D006968:Hypersensitivity, Delayed; D007251:Influenza, Human / Q000276:immunology*; D008213:Lymphocyte Activation; D009103:Multiple Sclerosis / Q000276:immunology; D013997:Time Factors; D014374:Tuberculin Test