• Cytokines are proteins normally released by the immune system but, in some people, this reaction goes into overdrive, causing dangerous organ inflammation.
  • Cytokine storm is being increasingly reported in COVID-19 patients several weeks after the initial infection and is linked to many deaths.
  • Cytokine storm is similar to the immune response seen in people with Still's disease, a type of arthritis.
  • Several anti-inflammatory drugs used to treat arthritis are being investigated as possible treatments for COVID-19.