immunoglobulin G: a class of circulating antibodies predominant in serum, produced by plasma cells and memory cells in response to pathogens and other foreign substances, able to pass through the placental wall to the fetal circulation to impart immune defense for the period of infancy.
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The antibodies they collected from people soon after their recovery included IgG antibodies, which circulate in the blood and generally decline in number after about a month since they are designed to quickly respond to new viruses.
“Given the volume of IgG antibodies delivered in our therapy, and the timing of these tests, it is likely that the second test is detecting REGN-COV2 antibodies,” said Hala Mirza, a spokeswoman for Regeneron.