MUC1 and COVID-19: In a subsequent paper, Varble N. al. sought to investigate and characterize the associations between clinical, laboratory, and imaging characteristics of asymptomatic and pre-symptomatic patients with SARS-CoV-2, finding that serum KL-6 value was one of the best parameters to distinguish asymptomatic patients with COVID-19-related CT infiltrates from asymptomatic patients without CT changes [27].