IL6 and infection: Moreover, in line with the previous reported findings, in another study from Atanasova and colleagues [136], after PRCV experimental infection, high titers of IFN-α and IL-6 were found in the lung secretions of all the pigs under study between 1 and 5 DPI, after which the titers decreased, and by day 15, IFN-α and IL-6 were no longer detectable.