A similar study found a strong association between COVID-19 severity and elevated levels of C-reactive protein (CRP), procalcitonin, interleukin-6, neutrophils, hs-troponin T, lactate dehydrogenase (LDH), ferritin and D-dimers, along with decreased levels of albumin, lymphocytes and platelets [8]. Here, IL6 is linked to COVID-19.