According to the Expert Consensus on Laboratory Diagnosis and Clinical Application of EBV infection (National Collaborative Group on EB Virus Infection in Children and Editorial Board of Chinese Journal of Experimental and Clinical Virology, 2018), among 152 patients with IM, the positivity rates of EA-IgA and VCA-IgA were 32% (21/65) and 31% (20/64), respectively, and the positivity rate of VCA-IgM was 83% (77/93). The gene discussed is CD40LG; the disease is Epstein-Barr virus infection.