John Coffin, a retrovirologist who was a member of the advisory panel and voted to support a screening question, said that he still didn't know for certain whether or not XMRV is associated with chronic fatigue syndrome.
But he said there was enough scientific evidence to support the notion that at least some cases of the condition are caused by an infectious agent.
"Even if it turns out that XMRV is not the cause, there might be something else and prudence dictates a deferral of blood donations,'' Dr. Coffin said.
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