title: Post-infective and chronic fatigue syndromes precipitated by viral and non-viral pathogens: prospective cohort study.
abstract: OBJECTIVE
  To delineate the risk factors, symptom patterns, and longitudinal course of prolonged illnesses after a variety of acute infections.
  
  
  METHODS
  Prospective cohort study following patients from the time of acute infection with Epstein-Barr virus (glandular fever), Coxiella burnetii (Q fever), or Ross River virus (epidemic polyarthritis).
  
  
  METHODS
  The region surrounding the township of Dubbo in rural Australia, encompassing a 200 km geographical radius and 104,400 residents.
  
  
  METHODS
  253 patients enrolled and followed at regular intervals over 12 months by self report, structured interview, and clinical assessment.
  
  
  METHODS
  Detailed medical, psychiatric, and laboratory evaluations at six months to apply diagnostic criteria for chronic fatigue syndrome. Premorbid and intercurrent illness characteristics recorded to define risk factors for chronic fatigue syndrome. Self reported illness phenotypes compared between infective groups.
  
  
  RESULTS
  Prolonged illness characterised by disabling fatigue, musculoskeletal pain, neurocognitive difficulties, and mood disturbance was evident in 29 (12%) of 253 participants at six months, of whom 28 (11%) met the diagnostic criteria for chronic fatigue syndrome. This post-infective fatigue syndrome phenotype was stereotyped and occurred at a similar incidence after each infection. The syndrome was predicted largely by the severity of the acute illness rather than by demographic, psychological, or microbiological factors.
  
  
  CONCLUSIONS
  A relatively uniform post-infective fatigue syndrome persists in a significant minority of patients for six months or more after clinical infection with several different viral and non-viral micro-organisms. Post-infective fatigue syndrome is a valid illness model for investigating one pathophysiological pathway to chronic fatigue syndrome.
authors.affiliation: Brain and Mind Research Institute, Sydney University, Sydney, NSW 2050, Australia.
authors.forename: Ian
authors.initials: I
authors.lastname: Hickie
authors.forename: Tracey
authors.initials: T
authors.lastname: Davenport
authors.forename: Denis
authors.initials: D
authors.lastname: Wakefield
authors.forename: Ute
authors.initials: U
authors.lastname: Vollmer-Conna
authors.forename: Barbara
authors.initials: B
authors.lastname: Cameron
authors.forename: Suzanne D
authors.initials: SD
authors.lastname: Vernon
authors.forename: William C
authors.initials: WC
authors.lastname: Reeves
authors.forename: Andrew
authors.initials: A
authors.lastname: Lloyd
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D015331:Cohort Studies; D005163:Factor Analysis, Statistical; D015673:Fatigue Syndrome, Chronic / Q000453:epidemiology / Q000382:microbiology*; D005260:Female; D006801:Humans; D015994:Incidence; D007239:Infections / Q000382:microbiology* / Q000821:virology; D008297:Male; D008875:Middle Aged; D009517:New South Wales / Q000453:epidemiology; D011446:Prospective Studies; D012111:Residence Characteristics; D012307:Risk Factors