IL6 and infection: However, controlling for other factors mentioned above, serum IL-6 levels showed association with infections at day 11 (OR = 116, p = 0.01, 95% CI = 4.0–3395.2) and at day 13 (OR = 11.9, p = 0.03, 95% CI = 1.2–117.6) (see also supplementary Table S1).