J Med Microbiol. 2021 Mar 18. doi: 10.1099/jmm.0.001335. Online ahead of print.
In this work, we studied the profile of IgM and IgG antibody responses to SARS-CoV-2 in 32 patients with COVID-19 from day 1 to day 24. IgM remained measurable for a much shorter period than IgG, suggesting that IgG antibody may represent the primary immune response.