Cytomegalovirus

By Levi Clancy for Student Reader on
updated

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Cytomegalovirus is asymptomatic in majority of cases. Causative agent of infectious mononucleosis. Transmission of cytomegalovirus (CMV):

  • In utero

  • Early childhood (saliva, etc)

  • Venereal in young adults

  • Blood transfusion (1-5% rate of transmission with a CMV(-) recipient and a CMV(+) donor)

  • Organ transplantation

Epstein-Barr Virus

EBV mononucleosis-Viral replication in the oropharynx, production of virus and transmission to others. Late antigen is VCA= viral capsid antigen. Antibodies induced. EBV latency: In B cells in blood. 10 Epstein-Barr nuclear antigens (EBNAs) plus the Latent Membrane Protein (LMP) are only viral antigens. EBNA-1 binds to Origin of replication and partitions circular DNA among B cell chromosomes. Reactivation from latency occurs through the BZLF protein, which activates transcription of viral genes. Eventually virus replicates, allowing transmission of the virus to seronegatives.

EBV and Lymphoproliferative Disorders: a) Burkitt's lymphoma, b) Nasopharyngeal carcinoma c) persons receiving organ transplants and immunosuppressive therapy d) Non-Hodgkin's lymphoma in HIV patients e) Clear role for EBV in Hodgkin's disease-over 50% are EBV DNA positive.