IGHE and COVID-19: In addition, several differentially-expressed indicators associated with inflammation and immunity, including C-reactive protein (CRP), prealbumin (PA), absolute values of CD4 lymphocytes and CD8 lymphocytes, IgE, SARS-CoV-2 IgM and SARS-CoV-2 IgG were comprehensively analyzed to explore the inflammatory and immune response of the body to the SARS-CoV-2 virus, and to find out the dynamic variation law of SARS-CoV-2 antibodies production in COVID-19 patients.