Mycoplasma pneumoniae immunoglobulin M (IgM), Chlamydia pneumoniae IgM, respiratory syncytial virus IgM, adenovirus IgM, coxsackievirus group B IgM, plasma fungal-d-glucan, serum galactomannan, serum cryptococcal podococcal antigen, T-cell spot test for tuberculosis infection, tumor markers, urine and stool routine, coagulation function, electrocardiogram, and cardiac ultrasound were all normal. This evidence concerns the gene CD40LG and neoplasm.