Essay by Anonymous UserHigh School, 12th gradeA+, January 1997

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Mononucleosis is an infectious disease of humans in which the blood and tissues contain mononuclear leukocytes (white blood cells with only one nucleus), either monocytes or lymphocytes. An infectious disease is a disease that can give you an infection, can be transmitted by infection without actual contact, or can be caused by a microorganism. All species of animals are afflicted with infections caused by a wide variety of organisms, from submicroscopic viruses to wormlike parasites. When a person has an infectious disease like mono the organism gains access to the patients body, survives, and then multiples. Next, the patient gets the symptoms. Then the patient may die or recover spontaneously, or the infection may respond to specific therapy. Often there is an immunity. Infectious diseases have strongly influenced the course of history on Earth. The organisms responsible for human infections are viruses. Viruses are simple life forms consisting of nucleic acid, encoding genetic information, and surface components of protein that enable them to enter cells.

Viruses are unable to multiple outside of cells. Mono is found in the DNA in the body. Another name for mononucleosis is glandular fever because of the fever and swelling of the lymph nodes throughout the body. What causes mononucleosis is the Epstein-Barr virus (EBV), which is like herpes. The herpes virus also causes some cases of mono and other diseases. Mono usually occurs in adults 15 to 30 years old, but is known to appear at any age.

Mono symptoms include fever, chills, fatigue, malaise, sore throat, head-

aches, swelling of the lymph nodes (noticeable in the neck), and skin rashes. Liver inflammation may occur. Also, swelling of the upper eyelids is a common symptom. In some cases blood may be found in the urine. The throat is often red; a membrane, white to...