IFNB1 and listeriosis: In contrast, 3-day Listeria infection, triggered the expression of IFNL1 (coding IFN-λ1) and, to a lesser extent, IFNB1 (coding IFN-β) and IFNL2 (coding IFN-λ2) transcripts in HepG2 cells, while low levels of IFNB1 transcripts were detected in infected PMH.