CD40LG and COVID-19: Therefore, we summarize the kinetics of antibody response to SARS-CoV-2 in patients with COVID-19 including the specific IgM, IgG, and IgA against the S and the N proteins, to help us evaluate and employ the serological testing assays rapidly, and analyze the testing results reasonably, which help better contain the spread of the causative agent of SARS-CoV-2.