IL6 and COVID-19: However, in older COVID-19 patients more and stronger correlations could be detected with hs-CRP (all p < 0.01): IL8 (r = 0.548), MCP3 (r = 0.720), CXCL10 (r = 0.460), CCL23 (r = 0.577) and IL6 (r = 0.706).