Return to Contact Rugby After Infectious Mononucleosis
A 20-year-old male collegiate rugby flanker presents 10 days after the onset of fever, sore throat, and fatigue. His fever resolved 3 days ago, and he feels nearly back to normal. He wants to play in a contact match in 10 days. Laboratory testing shows Epstein-Barr virus viral capsid antigen IgM positive, platelets 140,000/microL, AST 88 U/L, and an ultrasound-measured spleen length of 13.5 cm. He has no abdominal pain, no left shoulder pain, and no history of splenic disease. He is otherwise healthy and takes no medications. His coach wants a clear answer today about whether he can practice with contact.
1. How would you counsel him about activity over the next 4-6 weeks?
Read the worked answer
He has acute Epstein-Barr virus infection with splenomegaly; the spleen is enlarged at 13.5 cm. The key risk is splenic rupture with contact or Valsalva-heavy activity.
- Avoid contact, collision, and heavy lifting until cleared. This includes rugby practice drills, tackling, scrumming, and heavy resistance training.
- Low-impact aerobic activity may begin if he has been afebrile for at least 24 hours, is hydrated, and has no worsening fatigue or abdominal pain. Start with walking or stationary cycling and progress by tolerance.
- Do not use “feeling better” as clearance. Splenic enlargement can persist after symptoms resolve.
- Reassess with repeat ultrasound in 4-6 weeks and repeat platelet and liver tests.
The 10-day contact match is not appropriate; he should be withheld from contact regardless of how well he feels.
2. What criteria would you require before clearing him for contact rugby?
Read the worked answer
Clear for contact only when all of the following are met:
- clinical recovery with no fever, fatigue, or abdominal symptoms;
- repeat imaging shows the spleen has returned to normal size for his body habitus;
- platelets and liver enzymes have normalized or are clearly improving;
- he has progressed through non-contact aerobic and strength work without symptoms;
- he understands the red-flag symptoms and agrees to report them immediately.
Most spleens normalize within 4-6 weeks, but some take longer. If the spleen remains enlarged at 6 weeks, continue contact restriction and reimage. Do not rely on a fixed “4-week rule” alone. A normal examination does not exclude persistent splenomegaly.
3. Which symptoms should prompt urgent evaluation?
Read the worked answer
Counsel him to seek emergency evaluation for:
- sudden severe left upper-quadrant or generalized abdominal pain;
- left shoulder pain (Kehr sign, suggesting diaphragmatic irritation from blood);
- dizziness, lightheadedness, fainting, or unexplained tachycardia;
- abdominal bloating or tenderness after any impact;
- inability to take a deep breath because of pain.
Splenic rupture can occur with minimal trauma and can be life-threatening. He should not drive himself if these symptoms occur. He also should avoid alcohol and contact activities while recovering, and he should tell teammates and coaches about the restriction so he is not pressured to play.