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Surnamed the “kissing disease” because it is primarily transmitted through saliva, mononucleosis is a very common viral infection that mainly affects teenagers and young adults. Although generally mild, it is characterized by significant fatigue and a sometimes lengthy recovery period that often surprises patients.

What Is Mononucleosis?

Mononucleosis is caused in most cases by the Epstein-Barr virus (EBV), a virus belonging to the herpesvirus family that is extremely widespread worldwide. It is estimated that more than 90% of adults have been infected with this virus at some point in their lives, often without knowing it, as the infection frequently goes unnoticed in young children.

How Is Mononucleosis Transmitted?

The virus is primarily transmitted through saliva, including kissing, sharing cutlery, glasses or bottles, and through respiratory droplets released when coughing or sneezing. More rarely, it can also be transmitted through blood (blood transfusions or organ transplants).

After the initial infection, the virus remains dormant in the body for life, residing in certain lymphocytes without causing symptoms in most people. Asymptomatic reactivation, with intermittent viral shedding in saliva, can occur even years after the initial infection.

Symptoms of Mononucleosis

The incubation period generally lasts 4 to 6 weeks after exposure to the virus. Symptoms then develop gradually.

The Classic Triad

Fever: Usually moderate to high, and may last 1 to 2 weeks.
Sore throat or pharyngitis: A very painful throat, with often severely inflamed tonsils covered by a whitish coating, which can resemble bacterial tonsillitis.
Swollen lymph nodes: Particularly in the neck, but other areas may also be affected, including the armpits and groin.

Other Common Symptoms

Intense and persistent fatigue — often the most noticeable and longest-lasting symptom.
Headaches.
Muscle and joint pain.
Loss of appetite.
Splenomegaly (enlarged spleen): Present in approximately 50% of patients and requiring specific precautions.
Hepatomegaly (enlarged liver): Occurs in approximately 10% of patients, sometimes accompanied by mild jaundice.
Skin rash: May appear spontaneously or, more frequently, after taking amoxicillin, which should be avoided if mononucleosis is suspected.

Why Does Fatigue Last So Long?

Fatigue associated with mononucleosis is particularly characteristic. It can persist for several weeks to several months after the other symptoms have disappeared, often surprising patients with its duration and intensity.

This prolonged post-viral fatigue is common and should not automatically be mistaken for a serious complication, although it should be monitored if it persists for several months.

The Risk to the Spleen: An Essential Precaution

Splenomegaly associated with mononucleosis makes the spleen more vulnerable and increases the risk of splenic rupture, a rare but potentially serious complication, particularly following abdominal trauma.

Avoid intense physical activity and contact sports for at least 3 to 4 weeks after symptoms begin.
A doctor may recommend an ultrasound to check whether the spleen has returned to its normal size before allowing a return to sports.
Any severe abdominal pain following an impact requires emergency medical attention.

Diagnosing Mononucleosis

Clinical examination: The combination of fever, sore throat and swollen lymph nodes is highly suggestive.
Complete blood count (CBC): May show a characteristic increase in lymphocytes, including atypical lymphocytes.
Monospot test (rapid test): Detects heterophile antibodies. Results are available within minutes, but false negatives can occur early in the illness.
EBV-specific serology: Helps confirm the diagnosis and is particularly useful in young children, in whom rapid tests are less reliable.

Treatment for Mononucleosis

There is no specific antiviral treatment for mononucleosis. Management focuses primarily on relieving symptoms.

Rest: Essential, particularly during the acute phase.
Adequate hydration: Drink plenty of fluids.
Pain relievers and fever reducers: Paracetamol (acetaminophen) can help relieve fever and pain. Avoid aspirin in children under 18.
Avoid amoxicillin unless specifically prescribed following medical assessment: It frequently causes a characteristic skin rash in patients with undiagnosed mononucleosis. The rash is generally not serious, but this antibiotic is not recommended for treating the viral infection itself.
Corticosteroids: Reserved for severe cases involving airway obstruction caused by significant tonsil swelling.

When Should You Seek Emergency Medical Care?

Seek urgent medical attention if you experience:

Difficulty breathing or swallowing, particularly if severely swollen tonsils are obstructing the airways.
Severe abdominal pain, especially in the upper left side of the abdomen, due to the risk of splenic rupture.
Severe dehydration.
Significant jaundice.
A very high fever that persists despite symptomatic treatment.

Which Doctor Should You Consult in Morocco?

General practitioner: For diagnosis and follow-up → docdialy.com/general-practitioner
Pediatrician: For children and teenagers → docdialy.com/pediatrician
ENT specialist: In cases of severe tonsillitis or diagnostic uncertainty → docdialy.com/ENT_specialist

Conclusion

Mononucleosis is a common viral infection that is generally mild but requires rest and patience because of the prolonged fatigue it can cause. The main precaution concerns the risk of splenic rupture, which makes temporarily avoiding sports essential.

If you experience persistent fever, a sore throat and ongoing fatigue, consult a doctor through Docdialy to confirm the diagnosis.

→ Consult a doctor in Morocco:docdialy.com/general-practitioner