IL6 and bacterial pneumonia: IL-6 was a clinically recognized laboratory index for the diagnosis of pulmonary infection.15 Lymphocytes were demonstrated to be very important for maintaining immune system function and virus clearance.16,17 The phenomenon of increased WBC and LC and decreased NC were observed in a small number of patients in the mild group and the severe group, considering that some patients may be associated with other bacterial pneumonia, and the phenomenon may be related to autoimmune mechanism.