title: African green monkey origin of the atypical cytopathic 'stealth virus' isolated from a patient with chronic fatigue syndrome.
abstract: BACKGROUND
  A cytomegalovirus-like 'stealth virus' had previously been isolated from a patient with the chronic fatigue syndrome (CFS).
  
  
  OBJECTIVE
  To determine the original derivation of this virus.
  
  
  METHODS
  DNA sequencing of cloned regions of the virus was performed and the sequences were compared using BLASTN and FASTA analyses against the entire GenBank database. Viral sequences were also used to design primers for the polymerase chain reaction (PCR).
  
  
  RESULTS
  DNA and amino acid sequence comparisons showed that the stealth virus was more closely related to the Colburn strain of simian cytomegalovirus (SCMV) than to CMV of either human or rhesus monkey origin or to any other sequenced herpesvirus. Similarity, but non-identity, between the stealth virus and SCMV, was confirmed using PCR.
  
  
  CONCLUSIONS
  The findings implicate the African green monkey as the probable source of the virus isolated from this CFS patient.
authors.affiliation: Department of Pathology, University of Southern California School of Medicine, 2011 Zonal Ave., Los Angeles, CA 90033, USA.
authors.forename: W J
authors.initials: WJ
authors.lastname: Martin
authors.forename: K N
authors.initials: KN
authors.lastname: Ahmed
authors.forename: L C
authors.initials: LC
authors.lastname: Zeng
authors.forename: J C
authors.initials: JC
authors.lastname: Olsen
authors.forename: J G
authors.initials: JG
authors.lastname: Seward
authors.forename: J S
authors.initials: JS
authors.lastname: Seehrai