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Table 2 Results of PCR for patients with chronic fatigue syndrome and controls.

From: Xenotropic murine leukemia virus-related virus is not associated with chronic fatigue syndrome in patients from different areas of the us in the 1990s

Patient category No. Subjects qPCR Pos. for XMRV Integrase qPCR Pos. for XMRV Env Nested PCR Pos. for MLV-RV Nested PCR Pos. for XMRV
Cohort 1      
CFS 61 9 0 61 0
Idiopathic chronic fatigue 6 0 0 6 0
Non-CFS virus disease* 3 0 0 3 0
Healthy donors 9 0 0 9 1
Cohort 2      
Rheumatoid arthritis 30 0 0 10** ND
Behcet's disease 20 0 0 ND ND
Systemic lupus erythematosus 10 0 0 ND ND
Cryopyrin-associated periodic syndromes 9 0 0 ND ND
Dermatomyositis 9 0 0 ND ND
Polymyositis 7 0 0 ND ND
Scleroderma 5 0 0 ND ND
Inclusion body myositis 4 0 0 ND ND
Other inflammatory diseases*** 3 0 0 ND ND
Healthy donors 50 0 0 ND ND
  1. *One patient each with chronic active hepatitis B virus infection; echovirus 6-associated meningoencephalitis, and acute Epstein-Barr virus infection, early convalescent stage
  2. **Only 10 out of a total 30 samples from patients with rheumatoid arthritis were tested in the nested PCR assay
  3. ***Other inflammatory diseases: interstitial lung disease, monoclonal gammapathy of undetermined significance, undifferentiated connective tissue disease