title: In vitro human reactivity to staphylococcal phage lysate.
abstract: The cell-mediated reactivity of normal individuals to staphylococcal phage lysate (SPL) were tested in vitro in the lymphocyte stimulation (LS) and leukocyte migration inhibition (LMI) assays. There were 95% positive responses in LS (stimulation ratio larger than or equal to 3 with p less than 0.01) and 67% positive responses in LMI (migration index less than or equal to 0.80). Enriched subpopulations of T and B lymphocytes were prepared with rosette formation and density gradient centrifugation. SPL stimulated lymphoproliferative responses in both T and B cell subpopulations whereas phytohemagglutinin (PHA) stimulated only the T cell subpopulation. Cord blood leukocytes were tested in the LS assay and 41% gave positive responses to SPL, 81% to PHA, and 17% with SLO. SPL appears to be a useful reagent for the in vitro study of cell-mediated reactivity, and may provide somewhat different information from that obtained with other mitogens or antigens.
mesh_terms: D000942:Antigens, Bacterial / Q000032:analysis*; D001402:B-Lymphocytes / Q000276:immunology; D002464:Cell Migration Inhibition; D004305:Dose-Response Relationship, Drug; D005312:Fetal Blood / Q000276:immunology; D006801:Humans; D007111:Immunity, Cellular; D066298:In Vitro Techniques; D007962:Leukocytes / Q000276:immunology; D008213:Lymphocyte Activation; D013204:Staphylococcus Phages / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000942:Antigens, Bacterial