![]() ![]() The immunoglobulin subtypes (total Ig, IgM, and IgG) and their respective reactivity to severe acute respiratory syndrome coronavirus 2 nucleocapsid, spike, and receptor-binding domain antigens of the samples were delineated and compared with the WHO International Standard to elucidate the exact binding antibody units of each CSCP sample and ensure the CSCP provides adequate reactivity for different types of serological test platforms. Samples in the panel were sourced from COVID-19 convalescent persons from March to May 2020. The DTS offers the benefit of shipping materials without a cold chain, allowing for greater access without deterioration of material integrity. ![]() The dried-tube specimen (DTS) procedure was used to develop the COVID-19 serology control panel (CSCP). ![]()
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