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Anti-spike IgG signal intensity in SARS-CoV-2 seropositive and seronegative blood samples. a Relationship of SARS-CoV-2 spike IgG signal intensity in archival (black), symptomatic high exposure (pink) and asymptomatic high exposure (teal) donors. b Comparison of archival sample IgG reactivity with symptomatic high exposure sample reactivity. Unpaired two-tailed t test
