CEACAM8 and COVID-19: The intensity of fluorescence and percentage of neutrophils positive for granulocyte activation marker CD66b was also significantly increased in COVID-19 patients compared with controls (1257 ± 408 and 605 ± 115.7, respectively; p < 0.0001; Fig. 1B and median and interquartile range of 6.220 (4.6–10.3) compared with 2.380 (1.83–3.98), respectively; p < 0.0001; Fig. 1C).