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Levels of IL-2 and IFN-γ in the lung lavage of pigs previously vaccinated with live-attenuated influenza virus (LAIV), whole-inactivated virus (WIV), or mock-vaccinated (NV) collected 5 days after pH1N1 challenge (Ca/04) or mock challenge (NC). The results are expressed as the mean ± SEM for each group.
