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IgM antibody response to respective SARS-CoV-2 epitopes at baseline, week 2, week 4, month 3 and month 6 in subjects administered Pfizer-BioNTech COVID-19 vaccine at week 0 and week 3. Antibody response is reported in Genalyte response units (GRU). NS represents a p-value >0.05, * represents a p-value ≤ 0.05, ** represents a p-value ≤ 0.01, *** represents a p-value ≤ 0.001, **** represents a p-value ≤ 0.0001.
