KRT18 and viral infectious disease: We inoculated K18-hACE2 mice intranasally with live SARS-CoV-2 WA-1/2020 virus at 1 × 104 plaque-forming units (PFU) (n = 10) or 1 × 105 PFU (n = 10) and observed progressive body weight loss, a marker of severe viral infection.