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Hit-and-run injury to the brain

March 02, 2006

New evidence on chronic fatigue causation: The 'Dubbo Infection Outcomes Study'

A seven-year tracking study has prompted scientists to suggest that chronic fatigue syndrome could be the result of brain injuries inflicted during the early stages of glandular fever.




Australian researchers have put the suggestion in this week's Journal of Infectious Diseases, which reveals new findings from the 'Dubbo Infection Outcomes Study'. Since 1999, a team led by UNSW Professor Andrew Lloyd have been tracking the long-term health of individuals infected with Epstein-Barr virus (EBV), Ross River virus (RRV) or Q fever infection. Their goal is to discover whether the post-infection fatigue syndrome that may affect up to 100,000 Australians is caused by the persistence of EBV, a weakened immune system, psychological vulnerability, or some combination of these.

Glandular fever - sometimes called 'the kissing disease' - is caused by Epstein-Barr virus (EBV). Transmitted via saliva, its acute symptoms include fever, sore throat, tiredness, and swollen lymph glands. Most patients recover within several weeks but one in ten young people will suffer prolonged symptoms, marked by fatigue. When these symptoms persist in disabling degree for six months or more, the illness may be diagnosed as chronic fatigue syndrome (CFS).

The researchers followed the course of illness among 39 people diagnosed with acute glandular fever. Eight patients developed a 'post-infective fatigue syndrome' lasting six months or longer, while the remaining 31 recovered uneventfully. Detailed studies of the activity of the Epstein-Barr virus in the blood and the immune response against the virus were conducted on blood samples collected from each individual over 12 months.

Commenting on the findings, Professor Lloyd says: "Our findings reveal that neither the virus nor an abnormal immune response explain the post-infective fatigue syndrome. We now suspect it's more like a hit and run injury to the brain.

"We believe that the parts of the brain that control perception of fatigue and pain get damaged during the acute infection phase of glandular fever. If you're still sick several weeks after infection, it seems that the symptoms aren't being driven by the activity of the virus in body, it's happening in the brain.\\\

University of New South Wales



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