IL6 and severe acute respiratory syndrome: High serum levels of pro-inflammatory cytokines (IFN-γ, IL-1, IL-6, IL-12 and TGFβ)(24,25) and chemokines (CCL2, CXCL10, CXCL9 and IL-8) have been detected in SARS patients, who develop the most severe clinical forms of disease in comparison with subjects with a milder illness(26–28).