IFNB1 and infection: While no IFN-β protein was detected at the start of infection (0 dpi) in all HIE tested, significant amounts were detected at 3 dpi with the D124 and I124 supernatants containing approximately 50 pg/mL IFN-β, J2 supernatants ~100 pg/mL, and C87 supernatants ~1000 pg/mL.