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"MLVs have now been found in another CFS cohort"
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The authors of this letter claimed there needed to be "independent replication before findings such as this can be accepted"[1].
It is interesting to note that an eminent group of researchers from the FDA and NIH, including Lasker Award winner, Dr Harry Alter (chief of the infectious disease division of the Department of Transfusion Medicine at the NIH) have recently published one such study.
They examined 41 PBMC-derived DNA samples from 37 patients meeting accepted diagnostic criteria for CFS and found MLV-like virus gag gene sequences in 32 of 37 (86.5%) compared with only 3 of 44 (6.8%) healthy volunteer blood donors. No evidence of mouse DNA contamination was detected in the PCR assay system or the clinical samples. Seven of 8 gag- positive patients tested again positive in a sample obtained nearly 15 y later.
References:
1. Lloyd A, White P, Wessely S, Sharpe M, Buchwald D. Comment on "Detection of an infectious retrovirus, XMRV, in blood cells of patients with chronic fatigue syndrome".
Science. 2010 May 14;328(5980):825;
2. Lo SC, Pripuzova N, Li B, Komaroff AL, Hung GC, Wang R, Alter HJ.
Detection of MLV-related virus gene sequences in blood of patients with chronic fatigue syndrome and healthy blood donors. Proc Natl Acad Sci U S A. 2010 Aug 23.