Q: Can EBV mononucleosis happen again, and does the virus cause cancer?
- Myeongchan Kim, MD
- 5 hours ago
- 3 min read
Medically reviewed by Sang Hyun Ahn, MD
Content edited by Myeongchan Kim, MD
This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
Question:
My 11-year-old child had a fever for four days. The fever has broken, but a blood test confirmed infectious mononucleosis caused by the Epstein-Barr Virus (EBV). A spleen ultrasound showed slight enlargement (10.8 cm), and the white blood cell (WBC) count is low (2,790). I heard that 90% of people get infected with EBV without even knowing it. If we hadn't done the blood test, I would have thought it was just a regular cold.
I have two questions:
Once infected, can a person get mononucleosis again? Also, I read online that EBV can cause cancer.
Does this mean the 90% of people infected with this virus are at risk of developing cancer? I'm feeling very anxious after reading scary things online.
Answer:
It is completely understandable that you were surprised and alarmed by your 11-year-old child's mononucleosis diagnosis. Here is a breakdown of what you need to know about the Epstein-Barr Virus (EBV) and mononucleosis.
Current Situation Assessment
Since the fever has subsided and the diagnosis is clear, this is a highly positive sign that your child is already in the recovery phase.
A slightly enlarged spleen (10.8 cm) and a temporarily low white blood cell count (2,790) are very common and expected reactions during the acute phase of this illness.
Can my child get mononucleosis again?
Generally, a person only experiences EBV infectious mononucleosis once in their lifetime.
After the initial infection, the virus remains dormant in the body. Because the body develops immunity, it is very rare for the virus to reactivate and cause mononucleosis symptoms again.
As long as your child is generally healthy and does not have a compromised immune system, you do not need to worry about recurrence.
Is there a real risk of cancer?
While it is true that about 90% of adults carry EBV, the vast majority live their entire lives without any virus-related issues.
The association with certain cancers (such as Burkitt lymphoma or nasopharyngeal carcinoma) only occurs under very specific and rare conditions involving complex regional, genetic, and severe immunological factors. For a typical healthy child, the practical risk is virtually nonexistent.
Maintaining standard, routine health check-ups as your child grows is more than enough.
Actionable Guidance & What to do now:
Protect the Spleen: It is crucial that your child avoids strenuous exercise, heavy lifting, and all contact sports for at least 4 weeks to prevent any risk of spleen rupture.
Rest: Ensure plenty of rest and adequate hydration.
Follow-up: The white blood cell count typically recovers within 2 to 4 weeks. Follow up with your pediatrician, who will likely schedule a follow-up blood test to monitor this progress.
Warning Signs (Seek immediate medical attention if these occur):
Severe pain in the upper left abdomen (the spleen area).
A recurrence of high fever accompanied by a severe sore throat.
Difficulty breathing, severe headache, or persistent vomiting.
EBV is an incredibly common virus, and the great news is that your child is already on the path to recovery. Try not to let extreme information found online cause unnecessary anxiety. Follow your doctor's follow-up care plan, strictly adhere to the spleen protection guidelines, and consult your doctor in person if any new or worsening symptoms appear.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
