n 111) and contacts (
K and
L) The normalized AUC of anti-RBD IgA (K) or IgG (L) ELISA for patients with gastrointestinal (GI) symptoms (
n 32) and without GI symptoms (
n 117) was plotted. The
r and
P values for the correlations in (C) to (G) were determined by two-tailed Spearman’s correlations. For (H) to (L), horizontal bars indicate median values. Statistical significance was determined using a two-tailed Mann-Whitney
U test.
P 0.005) and severity of symptoms (
P 0.0001) but not timing of sample collection relative to onset (
P 0.69) or age (
P 0.22) (Fig. 1, C to F). Concentrations of anti-RBD IgA antibodies correlated strongly with anti-RBD IgG concentrations (