igg , iga and igm antibodies to the virus , measured by elisa using synthetic peptides ( early antigen and ebna-1 ) and a cloned fusion protein ( ebna-1 ) , were normal in sera from 20 patients with ss , whereas infectious mononucleosis patients showed an increase in igm antibodies to ebna-1 and igg antibodies to early antigen .
C0042776
virus
C0971226
ebna-1