Although a second dose of a vaccine induced a significantly stronger anti-S2 IgG levels (median, 40.0 versus 5.0, P < 0.001), the decrease on day 45 after a second shot (median, 20.0) did not reach statistical significance ( P = 0.121), whereas it was significant on day 75 (median, 10.5, P < 0.001).
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Differential Antibody Response to mRNA COVID-19 Vaccines in Healthy Subjects.
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