studies and observational human disease data suggest the complement system contributes to SARS-CoV-2 pathogenesis, although how complement dysregulation develops in severe COVID-19 is unknown. Here, using a mouse-adapted SARS-CoV-2 virus (SARS2-N501Y) and a mouse model of COVID-19, we identify significant serologic and pulmonary complement activation post-infection. We observed C3 activation in airway and alveolar epithelia, and pulmonary vascular endothelia.
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