PT - JOURNAL ARTICLE AU - Kim, Alfred H.J. AU - Wu, Xiaobo AU - Atkinson, John P. TI - The beneficial and pathogenic roles of complement in COVID-19 AID - 10.3949/ccjm.87a.ccc065 DP - 2020 Oct 28 TA - Cleveland Clinic Journal of Medicine 4099 - http://www.ccjm.org/content/early/2020/10/27/ccjm.87a.ccc065.short 4100 - http://www.ccjm.org/content/early/2020/10/27/ccjm.87a.ccc065.full AB - We briefly summarize the complement system and its functions in immunity and disease. We present data supporting the requirement of complement to resolve COVID-19, and discuss how complement overactivation later in severe disease could drive multiorgan damage characteristic of fatal COVID-19.