Absence of evidence of Borna disease virus infection in Swedish patients with Chronic Fatigue Syndrome.
Evengård, B, Briese, T, Lindh, G et al. · Journal of neurovirology · 1999 · DOI
Quick Summary
Researchers tested whether a virus called Borna disease virus (BDV) might be causing ME/CFS in Swedish patients. They examined blood samples from 169 patients and 62 healthy controls using two different detection methods—one looking for antibodies (immune system markers) and another looking for viral genetic material. They found no evidence of BDV in any of the patient samples, suggesting this particular virus is not responsible for ME/CFS.
Why It Matters
Since an infectious trigger for ME/CFS has long been suspected, systematically testing candidate viral agents—including novel neurotropic viruses like BDV—helps narrow the search for causal or contributing factors. Ruling out BDV redirects research efforts toward other promising viral and microbial candidates, accelerating the identification of potential disease mechanisms.
Observed Findings
No specific antibodies to BDV proteins (N, P, or gp18) were detected in sera from 169 CFS patients or 62 controls via ELISA and Western immunoblot.
No BDV N-gene transcripts were found in PBMC from 18 patients with severe CFS using nested RT-PCR.
No BDV P-gene transcripts were detected in PBMC from the same 18 severe CFS patients using nested RT-PCR.
Serological and molecular findings were consistently negative across both patient and control groups.
Inferred Conclusions
Borna disease virus is not likely a significant pathogenic agent in Swedish CFS patients.
BDV does not appear to be a major infectious contributor to ME/CFS pathogenesis in this cohort.
Research resources should be redirected toward other candidate infectious agents (enteroviruses, herpesviruses, retroviruses) in CFS etiology.
Remaining Questions
Does BDV play a role in ME/CFS in other geographic populations or ethnic groups?
Could BDV cause ME/CFS in only a subgroup of patients (seronegative but active infection, or tissue-specific infection not detected in blood)?
Are other neurotropic viruses more likely involved in ME/CFS pathogenesis?
What This Study Does Not Prove
A negative result does not rule out BDV involvement in other ME/CFS populations (geographic variation, population genetics, or assay sensitivity differences may apply). It also does not establish that ME/CFS is definitively non-infectious; other pathogens remain under investigation. Additionally, the absence of current infection does not exclude past infection as a trigger for chronic dysfunction.
Tags
Symptom:Cognitive DysfunctionFatigue
Biomarker:AutoantibodiesBlood Biomarker
Phenotype:Infection-Triggered
Method Flag:Weak Case DefinitionSmall SampleExploratory Only