Infectious mononucleosis and Epstein-Barr virus. 1. Epidemiology, pathogenesis, immune response.

The evidence linking Epstein-Barr virus causally with infectious mononucleosis is compelling. The disease occurs only in persons who lack antibody to this virus, and serologic findings during the acute illness provide almost certain evidence for its etiologic association. Additional evidence is derived from transformation studies using lymphocytes from persons infected with Epstein-Barr virus. Epidemiologic studies have related the need for close contact with salivary secretions to the low communicability of infectious mononucleosis. The clinically relevant antibodies which develop during the disease, other than heterophile antibody, are those against the viral capsid antigen. Part 2 of this article considers the clinical picture, diagnosis, and management and begins on page 95.