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Serum levels of IFN-α after inoculation with Ad5–IFN-α or Ad5-null and PRRSV or mock challenge with medium from noninfected cell culture. Data are expressed as the mean ± SEM of 9 pigs in each of the Ad5–IFN-α/PRRSV and Ad5–IFN-α/mock groups and 10 pigs in the Ad5-null/PRRSV group through day 9; subsequently, the mean is based on 4 to 5 pigs per group.
