CD4 T cell phenotype after AS01-adjuvanted immunization is shaped by prior antigen or pathogen exposure
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By
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Robbert G. van der Most
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Geert Leroux-Roels
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June 22, 2026
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Clinical Scorecard: Influence of Previous Antigen or Pathogen Exposure on CD4 T Cell Phenotype Following AS01-Adjuvanted Vaccination
At a Glance
| Category | Detail |
|---|
| Condition | CD4 T-cell responses to AS01-adjuvanted vaccines |
| Key Mechanisms | Influence of pre-existing immune memory on CD4 T-cell phenotype and function |
| Target Population | Immunologically naïve to strongly pathogen-primed individuals |
| Care Setting | Clinical vaccine studies |
Key Highlights
- AS01 adjuvant enhances antigen-specific polyfunctional CD4 T cell-mediated immunity.
- Pre-existing immune memory shapes the quantity and quality of CD4 T-cell responses.
- Vaccine-induced CD4 T cells show varying responses based on prior exposure to pathogens.
- Clinical studies utilized validated intracellular cytokine staining assays for analysis.
- Different populations, including infants and immunocompromised individuals, exhibit varied responses.
Guideline-Based Recommendations
Diagnosis
Management
Monitoring & Follow-up
Risks
Patient & Prescribing Data
Includes infants, older adults, and immunocompromised individuals.
Responses to AS01-adjuvanted vaccines vary based on prior infection or vaccination history.
Clinical Best Practices
- Consider prior immune exposure when evaluating vaccine responses.
- Utilize validated assays for assessing CD4 T-cell functionality in clinical studies.
- Tailor vaccine development to the immune priming status of target populations.
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