E2 ModerateModerate confidencePEM unclearCase-ControlPeer-reviewedMachine draft
Humoral and cellular immune responses after influenza vaccination in patients with chronic fatigue syndrome.
Prinsen, Hetty, de Vries, I Jolanda M, Torensma, Ruurd et al. · BMC immunology · 2012 · DOI
Quick Summary
This study tested how well people with ME/CFS respond to the flu vaccine compared to healthy people. Researchers measured both antibody production (humoral immunity) and T cell activity (cellular immunity) before and after vaccination. The results showed that people with ME/CFS had immune responses to the flu vaccine that were similar to healthy controls, suggesting their immune systems can respond normally to this vaccine.
Why It Matters
This study addresses an important practical question for ME/CFS patients: whether vaccination is safe and effective given proposed immune dysfunction. The finding that immune responses to influenza vaccination are comparable to healthy controls provides evidence-based reassurance that standard seasonal flu vaccination can be recommended for this population.
Observed Findings
- Identical antibody titers and seroprotection rates against all three influenza strains in CFS patients and healthy controls both pre- and post-vaccination.
- CFS patients showed numerically lower baseline T cell proliferation compared to controls, though this did not reach statistical significance.
- Vaccination induced a significant increase in cellular proliferation in CFS patients but not in healthy controls.
- Comparable cytokine production and regulatory T cell numbers between CFS patients and healthy controls.
Inferred Conclusions
- The humoral and cellular immune responses upon influenza vaccination are comparable between CFS patients and healthy controls.
- Putative aberrations in immune responses in CFS patients are not evident for immunity toward influenza.
- Standard seasonal influenza vaccination is justified and should be recommended for CFS patients when indicated.
Remaining Questions
- Does the numerically lower baseline T cell proliferation in CFS patients reflect a genuine biological difference with clinical significance, or is it incidental?
- Why does vaccination induce significant T cell proliferation in CFS patients but not controls, and what does this indicate about their immune regulation?
What This Study Does Not Prove
This study does not establish whether ME/CFS involves immune dysfunction in general, only that responses to influenza vaccination specifically appear normal. It also does not address whether vaccination might trigger symptom exacerbation (post-exertional malaise) in some patients, nor does it explain the underlying cause of ME/CFS fatigue.
Tags
Symptom:Fatigue
Biomarker:CytokinesBlood Biomarker
Method Flag:PEM Not DefinedWeak Case DefinitionSmall Sample
Metadata
- DOI
- 10.1186/1471-2172-13-71
- PMID
- 23244635
- Review status
- Machine draft
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 8 April 2026
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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