IFNL1 and infection: We also found limited up-regulation of type III IFNs transcription upon wtCSFV infection in IPEC-J2 cells, though the transcription level peaked at 24 hpi and decreased thereafter, which is different from the results shown by Cai et al that the mRNA level of IFN-λ1 and IFN-λ3 induced by wtCSFV peaked at 36 and 48 hpi, respectively.