However, multiple inflammatory proteins are elevated in peripheral blood during CRS, including C-reactive protein, ferritin, interferon-γ, interleukins (IL-1, IL-2Rα, IL-6, IL-8, IL-10, IL-15), monocyte inflammatory proteins, monocyte chemoattractant proteins, and tumor necrosis factor receptors. Here, IL6 is linked to congenital rubella syndrome.