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Updated: Dec 29, 2025
Separation of Immune Cell Subpopulations in Peripheral Blood Samples from Children with Infectious Mononucleosis
Published on: September 7, 2022
Distinctive EBV infection characteristics in children from a developing country
N M Ferressini Gerpe1, A G Vistarop1, A Moyano1
1Laboratory of Molecular Biology, Ricardo Gutiérrez Children's Hospital, Multidisciplinary Institute of Pediatric Pathologies' Investigation (IMIPP-CONICET-GCBA), Gallo 1330, Buenos Aires, Argentina.
Insights
Epstein-Barr virus (EBV) infection in Argentinian children often remains asymptomatic due to low viral loads and restricted antigen expression. This pattern differs from healthy carriers, offering insights into viral persistence mechanisms.
Area of Science:
- Virology
- Pediatric Infectious Diseases
- Immunology
Background:
- Epstein-Barr virus (EBV) infection is typically asymptomatic in developing countries' early childhood.
- EBV persistence is linked to malignancies like B-cell lymphomas.
- Previous studies in Argentina show a higher association between EBV and lymphoma in children under 10.
Purpose of the Study:
- To characterize EBV infection in tonsils, the site of entry and reactivation.
- To understand the mechanisms of viral persistence in pediatric patients.
Main Methods:
- A cohort of 54 pediatric patients was analyzed.
- Assessed EBV antibody profiles in sera.
- Determined viral protein presence using immunohistochemistry (IHC) on FFPE samples.
- Typed EBV from fresh tissue samples.
Main Results:
- EBV type 1 was prevalent, particularly in younger children.
- Asymptomatic primary infections showed higher viral loads and Latency 0/I or II patterns.
- Latency III patterns were more common in healthy EBV carriers.
- No significant differences in viral lytic antigen expression were found between groups.
Conclusions:
- Low viral inoculum and restricted viral antigen expression may explain asymptomatic primary EBV infections in Argentinian children.
- These findings reveal unique aspects of primary EBV infection in a developing country's pediatric population.
- Understanding these patterns is crucial for managing EBV-associated risks.
Background:
In developing countries, Epstein-Barr virus (EBV) infection is mostly asymptomatic in early childhood. EBV persistence may lead to different malignancies, such as B cell derived lymphomas. In Argentina, most children are seropositive at three years and an increased association between EBV and lymphoma was proved in children under 10 years old by our group.
Objective:
Our aim was to characterize EBV infection at the site of entry and reactivation of viral infection -the tonsils- in order to better understand the mechanism of viral persistence in pediatric patients.
Methods:
A cohort of 54 patients was described. We assessed specific antibodies profiles in sera; viral proteins presence by IHC on FFPE samples and EBV type from fresh tissue.
Results:
EBV type 1 was prevalent, mostly in the youngest patients. Asymptomatic primary infected patients presented higher viral loads and Latency 0/I or II patterns, whereas the Latency III pattern was observed mostly in healthy carriers. There were no differences between groups in the expression of viral lytic antigens. This study discloses new features in patients undergoing primary infection from a developing population. Low viral inoculum and restricted viral antigen expression may be responsible for the lack of symptoms in children from our country.
