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Interferon gamma (IFN-γ) in supernates from the cytotoxicity assays after 3 and 7 days of stimulation with influenza A/Taiwan/86 (H1N1) or B/Panama/45/90 infected cells at the mean times shown. Because of variability in baseline values, results are shown as the mean ratio of IFN-γ in supernates from stimulated to that in unstimulated cells (stimulation index) for subjects given influenza vaccine with or without QS21 adjuvant.
