Fig. 4: Comparison of serum cytokine/chemokine concentrations between the asymptomatic and symptomatic groups.
From: Clinical and immunological assessment of asymptomatic SARS-CoV-2 infections

Samples from asymptomatic (n = 37) and symptomatic (n = 37) patients with COVID-19 were collected in the acute phase during hospitalization, and assays were performed to measure the concentrations of 48 cytokines and chemokines. The box plots show the medians (middle line) and first and third quartiles (boxes), and the whiskers show 1.5× the IQR above and below the box. Unpaired, two-sided Mann–Whitney U test P values are depicted in the plots, and the significant P value cutoff was set at 0.001.