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The serum cytokines and PA-IgG levels in different groups and comparison (Single virus: n = 7; Single f/b: n = 37; Multiple pathogens: n = 15; Unidentified: n = 20; Healthy: n = 10). The bars represent the mean of each group of data, and the vertical line represents the error line and the end is the standard deviation value. * and ** indicate the statistical significant at P < .05 and P < 0. 01, respectively.
