A number of viral illnesses mainly involve the lymphoid system and blood vessels. Two notable examples are the human immunodeficiency virus (HIV), cause of AIDS, and cytomegalovirus, which causes lymph node enlargement in healthy adults and more serious disease in infants and individuals with immuno deficiency. Infectious mononucleosis has similar symptoms, but it is a much more familiar disease. Yellow fever more prominently involves the circulatory system. ■ human immunodeficiency virus disease, p. 740 ■ cytomegalovirus disease, p. 757
"Kissing Disease" (Infectious Mononucleosis,"Mono")
Infectious mononucleosis ("mono") is a disease familiar to many students because of its high incidence among people between the ages of15 and 24 years. The term mononucleosis refers to the fact that people afflicted with this condition have an increased number of mononuclear leukocytes in their blood. ■ leukocytes, p. 376
28.4 Viral Diseases of the Lymphoid and Blood Vascular Systems 727
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