Although Vero E6 is deficient in its type I IFN response, hantaviruses can induce type III IFNλ (IL-29) production in Vero E6 about a week after infection [42], thus it is possible the diffuse appearance of the day 7 Vero E6 cells may be caused by the presence of IFNλ stimulation of the innate response. Here, IFNL1 is linked to infection.