NIH3T3 reporter cells were infected with MCMV, treated with IFNβ or IFNλ for 6 h and lysed for quantification of reporter gene expression (Le‐Trilling et al, 2018 (link)). Luciferase activity was measured according to the manufacturer's instructions (pjk) using a microplate multireader (Mithras2 LB 943; Berthold Technologies). Quantification of luminescence was performed by use of the microplate multireader Mithras2 LB 943 and MicroWin software (Berthold Technologies). The resulting data were analysed using GraphPad Prism software. The values are reported as mean ± standard deviation (SD) as described in the figure legends.