CD163 and infection: In both Delta and Omicron variant infections, sB7-H3 showed a moderate correlation with sCD163 (R = 0.30, p = 0.0027 for Delta; R = 0.41, p = 0.0018 for Omicron), while only in Omicron-infected subjects Gal-9 displayed a positive association with both sB7-H3 (R = 0.54, p < 0.0001) and sCD163 (R = 0.37, p = 0.0056).