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Neutralization of IFN-γ in the fluid phase obtained by BAL (27) from μMT mice challenged 14 days previously with MHV-68. Treatment with the XMG1.2 mAb (29) was begun 2 days prior to i.n. infection with 600 pfu of virus and then continued every second day until time of sampling. The numbers given are for individual mice, and the sensitivity of the ELISA was 15 pg/ml.
