CD40LG and Pleural effusion: There were no differences in maximum temperature, incidence of wheezing, extrapulmonary complications, hypoxemia, pleural effusion, white blood cell count, percentage of neutrophils, percentage of lymphocytes, NLR, D-dimer, AST, IgG, IgM, and CK-MB between the two groups (all P > 0.05, Table 2).