Complement plays an important role in the direct defense to pathogens. but can also activate immune cells and the release of pro-inflammatory cytokines. However. in critically ill patients with COVID-19 the immune system is inadequately activated leading to severe acute respiratory syndrome (SARS) and acute kidney injury. https://www.alarecre.com/Looney-Tunes-Marvin-the-Martian-Big-Head-Galaxy-S23-Waterproof-Case-p116784/