CCL4 and COVID-19: Of the 12 cytokines found to have reduced SARS‐CoV‐2‐induced secretion following BCG vaccination in our study, nine have been associated with severe COVID‐19, namely G‐CSF,16, 17 GM‐CSF,18, 19 HGF,18 IL‐6,17, 18, 20, 21, 22, 23, 24, 25 IL‐10,16, 17, 18, 20, 21, 22, 23 LIF,18 MIP‐1β (CCL4),18 RANTES (CCL5)18, 24 and TNF‐α.17, 18, 20, 24, 25