title: [Follow up study on viruses associated with SARS among the SARS patients].
abstract: BACKGROUND
  To study the existence status of the SARS-CoV, retrovirus, and the poliovirus in the bodies of the patients with SARS and the possible relationship between the three viruses and SARS.
  
  
  METHODS
  The clinical specimens of the nasopharyngeal swabs, sputum (or saliva), urine, fecal specimens were collected on three consecutive days from 8 patients with SARS 2 years after the recovery from SARS. SARS-CoV, reovirus and poliovirus RNA was detected by using reverse transcription (RT)-PCR; IgG antibody to the poliovirus type 1 and 3 and the antibody to SARS-CoV were determined using enzyme linked immunosorbent assay (ELISA).
  
  
  RESULTS
  All the specimens were negative for SARS-CoV and reovirus by RT-PCR, but the fecal specimens from 4 persons were positive for poliovirus. The sequences of these poliovirus were highly homologous to that of human poliovirus type 1 strain sabin 1 genome at nucleotide level, but back mutations have occurred in the primary attenuating mutation sites at nucleotide position 480 (G --> A) in the 5' UTR and the nucleotide position 2795 (A --> G). No SARS-CoV, reovirus, and poliovirus were found in the normal controls. Three serum specimens were positive for the antibody to SARS-CoV. The IgG antibody to poliovirus were detected in 4 SARS patients and 23 healthy persons. No positive results for antibody to SARS-CoV were detected in the 25 healthy persons.
  
  
  CONCLUSIONS
  The positive rate of the poliovirus antibody in the serum of SARS patients 2 years after recovery was significantly different from that of the normal controls, and the positive rate of poliovirus in the fecal specimens was still very high, and more importantly back mutations have occurred in the attenuating mutation sites at nucleotide position which plays an important role in the poliomyelitis.
authors.affiliation: Postgraduate Medical School, The People's Liberation Army, Beijing 100853, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Sun
authors.forename: Shao-jie
authors.initials: SJ
authors.lastname: Xin
authors.forename: Hong-hui
authors.initials: HH
authors.lastname: Shen
authors.forename: Yan
authors.initials: Y
authors.lastname: Hu
authors.forename: Dong-ping
authors.initials: DP
authors.lastname: Xu
authors.forename: Hong
authors.initials: H
authors.lastname: Zhu
authors.forename: Lei
authors.initials: L
authors.lastname: Zhu
authors.forename: Qing
authors.initials: Q
authors.lastname: Duan
authors.forename: Pan-yong
authors.initials: PY
authors.lastname: Mao
mesh_terms: D000328:Adult; D000914:Antibodies, Viral / Q000097:blood; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005500:Follow-Up Studies; D015967:Gene Expression Regulation, Viral; D006801:Humans; D008297:Male; D009154:Mutation; D017955:Poliovirus / Q000235:genetics / Q000276:immunology; D012367:RNA, Viral / Q000032:analysis / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D045473:Severe acute respiratory syndrome-related coronavirus / Q000235:genetics* / Q000276:immunology*; D045169:Severe Acute Respiratory Syndrome / Q000821:virology*
chemical_list: D000914:Antibodies, Viral; D012367:RNA, Viral