The average size of the foci at 48 h post infection was 13.8 (SD = 5.7) on the SK-6 cells, 13.2 (SD = 5.6) on the SK-6KO-ADAM17 cells, and 12.7 (SD = 4.8) on the SK-6KO/KI-ADAM17 cells. Here, ADAM17 is linked to infection.