Infectious mononucleosis

At a Glance

Infectious mononucleosis is a contagious viral disease primarily caused by the Epstein-Barr virus (EBV), also known as 'mono' or 'kissing disease'.

Representative manifestations include severe fatigue, fever, sore throat, headache and body aches, and swelling of the neck and axillary lymph nodes, which may be accompanied by rash or liver and spleen enlargement.

How the disease works

EBV and related viruses are mainly transmitted through saliva, and infection can occur through sharing food, drinks, utensils, lip balm, or kissing.

As the immune response activates following infection, symptoms such as fever, sore throat, lymph node enlargement, and fatigue appear, and EBV is primarily associated with B lymphocytes.

Variations in presentation among individuals

EBV infection is common, but symptomatic mononucleosis occurs in only some individuals; pediatric infections are often asymptomatic, while typical symptoms appear more clearly in adolescents and young adults.

The broad framework of diagnosis and management

Symptoms usually begin gradually about 4–6 weeks after infection and most improve within 2–4 weeks, but fatigue may persist for several more weeks or, rarely, for more than 6 months.

Diagnosis is based on symptoms and physical examination, confirming the status of lymph nodes, tonsils, liver, and spleen, and performing mononucleosis tests if necessary.

Current status of treatment

Symptoms may overlap with other viral pharyngitis, and since test results are influenced by the timing of infection and the testing method, they are not interpreted based on a single test alone.

Management focuses on supportive care, such as adequate hydration, rest, and relief of pain and fever, and involves reducing behaviors with transmission potential, such as sharing saliva and kissing.

Since mononucleosis itself is a viral infection, antibiotics are not a therapeutic agent; separate evaluation and treatment are only necessary when bacterial co-infection or organ complications are suspected.

How to read clinical trials

Fatigue and splenomegaly may be observed during the recovery process, and it is recommended to avoid strenuous exercise and contact sports until full recovery to reduce the risk of splenic rupture; effectiveness cannot be determined by trial registration alone.

Points to verify during clinical consultations

In clinical practice, one can verify the timing of symptom onset and exposure, the severity and duration of fatigue, medications taken, abdominal pain or exercise plans, bacterial co-infections, and whether liver/spleen symptoms are present.