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IFN-γ response after in vitro (re)stimulation. PBMC from non infected (naïve) and PRV infected animals (4, 8, 12 weeks after infection) were either stimulated with ConA or with PRV. The content of IFN-γ in the PBMC supernatants was quantified after 24 and 72 h in the IFN-γ specific ELISA.
