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Antigen-specific IFN-γ responses in whole-blood cultures. Levels of IFN-γ released from whole-blood cultures stimulated with M. avium subsp. paratuberculosis recombinant antigens from calves in groups Vac2w, Vac8w, Vac16w and adjuvant controls following vaccinations, indicated as dotted lines. IFN-γ levels are expressed as mean values (± standard deviations) for plasma concentrations (pg/ml).
