Introduction: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread rapidly to 185 regions and countries around the world with more than 2.8 million confirmed infections and 203,044 deaths. Respiratory diseases caused by SARS-CoV-2 are serious threats to human health.
Objectives: To develop a rapid detection kit for new coronavirus antibodies and use it to study the dynamic changes in antibodies in clinically confirmed SARS-CoV-2-infected patients.
Methods: The SARS-CoV-2 IgM/IgG antibody test kit (colloidal gold method) was developed. Serum SARS-CoV-2 IgM and IgG antibodies were tested in SARS-CoV-2- and non-SARS-CoV-2-infected persons, respectively.
Results and conclusion: The sensitivities of the SARS-CoV-2 IgM/IgG antibody test kit (colloidal gold method) were 50%, 70%, 92.5% and 97.5% after 1-3 days, 4-6 days, 7-9 days and >9 days of admission, respectively, and the specificities of the IgM, IgG and IgM + IgG antibodies were all 100%. Using the SARS-CoV-2 IgM/IgG antibody test kit (colloidal gold method), the positive rates of SARS-CoV-2 IgM and IgG antibodies increased from 50% to 92.5% after 1-3 days, 4-6 days and 7-9 days of admission, which showed an increasing trend. The titers of the SARS-CoV-2 IgM and IgG antibodies in the positive specimens increased with the length of admission.
Keywords: COVID-19; SARS-CoV-2; antibody; colloidal gold immunochromatography; infection.
© 2021 John Wiley & Sons Ltd.