IGHG3 and COVID-19: The analysis of sera from 253 COVID‐19–convalescent patients showed that the antibody response against the spike protein and RBD is dominated by the IgG isotype, in particular by the IgG1 subclass which is in agreement with an earlier report32 and is similar as was found for other respiratory viruses (eg, RV and RSV) which did not induce IgG3 and IgG4 responses.20, 33