Incidence of Lyme disease in the United Kingdom and association with fatigue: A population-based, historical cohort study.
Brellier, Florence, Pujades-Rodriguez, Mar, Powell, Emma et al. · PloS one · 2022 · DOI
Quick Summary
This study tracked over 2,100 people in the UK who were diagnosed with Lyme disease and compared them to similar people without Lyme disease. Researchers found that people with Lyme disease were much more likely to develop fatigue symptoms afterward, and some developed ME/CFS. Interestingly, the risk was highest when Lyme disease occurred in autumn or winter, though fatigue risks remained elevated even months after the initial infection.
Why It Matters
This study provides evidence that Lyme disease may be a trigger or risk factor for ME/CFS development in some patients, supporting long-standing clinical observations. For ME/CFS patients with Lyme disease history, it validates concerns about post-infection fatigue and justifies ongoing symptom monitoring. The findings encourage healthcare providers to recognize and appropriately manage fatigue emerging months or years after Lyme diagnosis.
Observed Findings
Lyme disease incidence in the UK increased from 2.55 per 100,000 person-years in 2000 to 9.33 in 2018.
Fatigue consultation rates were 307.90 per 10,000 person-years in Lyme patients versus 165.60 in matched controls.
ME/CFS incidence was 11.76 per 10,000 person-years in Lyme patients versus 1.20 in comparators.
Risk of fatigue after Lyme disease was highest for infections diagnosed in autumn (HR 3.14) and winter (HR 2.23).
Associations between Lyme disease and fatigue persisted beyond 6 months post-diagnosis, though with reduced effect sizes.
Inferred Conclusions
Lyme disease is associated with substantially increased risk of developing fatigue and ME/CFS in the months and years following infection.
Seasonal variation in risk suggests environmental or biological factors at the time of infection may influence likelihood of chronic fatigue sequelae.
Healthcare providers should maintain vigilance for fatigue symptoms in Lyme disease patients well beyond the acute infection period.
Lyme disease may represent an identifiable trigger or contributing factor for ME/CFS development in a subset of affected individuals.
Remaining Questions
What biological or immunological mechanisms explain the association between Lyme disease and subsequent ME/CFS?
What This Study Does Not Prove
This study shows correlation between Lyme disease and subsequent fatigue/ME/CFS but cannot definitively prove causation—unmeasured factors could explain both. The study captures only patients consulting their doctor for fatigue, likely underestimating true incidence. It does not identify the biological mechanisms linking Lyme disease to ME/CFS or predict which Lyme patients will develop ME/CFS.
Tags
Symptom:Fatigue
Phenotype:Infection-Triggered
Method Flag:PEM Not DefinedWeak Case DefinitionMixed Cohort