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Comparison of anti-spike antibody and B cell responses between patients with (n = 5) and without (n = 20) pneumonia (A) and patients with (n = 14) and without (n = 11) fever (B). Each point represents antibody or B cell response for each patient, and the red line represents mean ± standard error of mean. Unpaired two-tailed t test was used to compare the difference between two groups. *, P < 0.05; **, P < 0.01; ***, P < 0.001. ns, not significant. HAT, hemagglutination titer.
