While IFNβ treated samples infected at an MOI of 0.1 and 0.01 showed substantial virus titers by 7 dpi and later (Fig. 1B, upper panels), MCMV replication was completely abrogated, when the infection was performed at MOIs below 0.01 (Fig. 1B, lower panels). The gene discussed is IFNB1; the disease is infection.