criteria for a primary ebv infection are ( 1 ) an antiviral capsid antigen titer of 1:160 or greater , ( 2 ) the presence of antibody to the diffuse component of the early antigen , ( 3 ) absence of antibody to the nuclear antigen , and ( 4 ) excretion of the virus from the oropharynx .
C0003320
antigen
C0069115
nuclear antigen