EBV does not have a titer, it is the EBV DNA load normal range is <1.0×10^3 EBV belongs to the genus Herpesvirus and is a lymphocytophilic DNA virus with latent and transforming characteristics.EBV has the biological property of infecting humans exogenously and ex vivo. Humans are the hosts of EBV infection, which is mainly transmitted through saliva, and the normal range is <1.0×10^3. EBV can cause infectious mononucleosis, Burkitt's lymphoma, nasopharyngeal carcinoma and other diseases. Generally, serum EBV-specific antibody test and quantitative EBV DNA test can be used to determine whether the patient is being infected by EBV, and other auxiliary tests such as lymph node ultrasound, lymph node biopsy, serum phagocytosis agglutination test, and peripheral blood smear, etc., can be added to correspond to different diseases. If the patient has a high DNA load of EBV, he should consult the hospital in time to clarify the cause of the disease and carry out treatment.