IL6 and COVID-19: The newly developed guideline “Neurological manifestations in COVID-19—updated on 22.02.2021” of the German Society of Neurology (https://dgn.org/leitlinien/neurologische-manifestationen-bei-covid-19) mentions IL-2, IL-7, granulocyte colony-stimulating factor (GCSF) and TNF-α, in addition to IL-6 as potential biomarkers to estimate the risk of severe courses or encephalopathy.