CXCL10 and COVID-19: Levels of CCL2 and CCL8 in BAL fluid as well as CXCL10 in plasma samples collected during the first 48 hours of intubation were higher in patients with COVID-19 relative to all other groups, with the exception of patients with other viral pneumonias (q < 0.05, Mann-Whitney; Figure 2, C and D).