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Chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) is associated with pandemic influenza infection, but not with an adjuvanted pandemic influenza vaccine
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Chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) is associated with pandemic influenza infection, but not with an adjuvanted pandemic influenza vaccine
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Chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) is associated with pandemic influenza infection, but not with an adjuvanted pandemic influenza vaccine
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Journal Article
Chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) is associated with pandemic influenza infection, but not with an adjuvanted pandemic influenza vaccine
2015
Overview
Chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) is associated to infections and it has been suggested that vaccination can trigger the disease. However, little is known about the specific association between clinically manifest influenza/influenza vaccine and CFS/ME. As part of a registry surveillance of adverse effects after mass vaccination in Norway during the 2009 influenza A (H1N1) pandemic, we had the opportunity to estimate and contrast the risk of CFS/ME after infection and vaccination.
Using the unique personal identification number assigned to everybody who is registered as resident in Norway, we followed the complete Norwegian population as of October 1, 2009, through national registries of vaccination, communicable diseases, primary health, and specialist health care until December 31, 2012. Hazard ratios (HRs) of CFS/ME, as diagnosed in the specialist health care services (diagnostic code G93.3 in the International Classification of Diseases, Version 10), after influenza infection and/or vaccination were estimated using Cox proportional-hazards regression.
The incidence rate of CFS/ME was 2.08 per 100,000 person-months at risk. The adjusted HR of CFS/ME after pandemic vaccination was 0.97 (95% confidence interval [CI]: 0.91–1.04), while it was 2.04 (95% CI: 1.78–2.33) after being diagnosed with influenza infection during the peak pandemic period.
Pandemic influenza A (H1N1) infection was associated with a more than two-fold increased risk of CFS/ME. We found no indication of increased risk of CFS/ME after vaccination. Our findings are consistent with a model whereby symptomatic infection, rather than antigenic stimulation may trigger CFS/ME.
Publisher
Elsevier Ltd,Elsevier Limited
Subject
/ Adult
/ Aged
/ Child
/ Chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME)
/ Cohort
/ Drug-Related Side Effects and Adverse Reactions - epidemiology
/ Drug-Related Side Effects and Adverse Reactions - pathology
/ Fatigue
/ Fatigue Syndrome, Chronic - epidemiology
/ Female
/ Humans
/ Infant
/ Influenza Vaccines - administration & dosage
/ Influenza Vaccines - adverse effects
/ Influenza, Human - complications
/ Male
/ Norway
/ pandemic
/ risk
/ Studies
/ Vaccines
