In the first experiment, Vero E6 and Huh7 cells were either mock infected with media or infected with SARS-CoV-2 and harvested at 6-, 24- and 48-h post-infection (hpi) to determine the baseline mRNA expression levels of VDR, 24(OH)ase, and LL-37 without calcitriol treatment. Here, VDR is linked to infection.