IFNB1 and listeriosis: Further, we found that though poly(dA-dT) or poly(I:C) or cGAMP transfection or Listeria monocytogenes infection could, Ld-DNA transfection failed to induce significant IFNβ-luciferase reporter activation in HEK-293-IFNβ-luc reporter cells (Fig. 5C).