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. 2021 Jul 1;12:668725. doi: 10.3389/fimmu.2021.668725

Figure 1.

Figure 1

Serum concentrations of the anaphylatoxins in critical and mild COVID-19 patients, and healthy controls. Concentrations of (A) complement fragment C5a; (B) complement fragment C3a; (C) complement fragment C1q; and (D) complement fragment C2 were measured using ELISA. ANOVA and Tukey’s multiple comparison test were used for statistical comparisons. *p < 0.05, ***p < 0.001, and ns p > 0.05.