Researchers who first found a possible link between a virus and chronic fatigue syndrome are defending their work, even though two new studies say that link is probably nonexistent.
One of the researchers says it would be "premature" to retract the initial findings.
Still, the journal "Science" took the unusual step Tuesday of saying that any such link is "seriously in question."
It's another blow to people who suffer from the mysterious illness, and who hope that finding a cause would lead to a cure.
An association of people with chronic fatigue says it will wait for more rigorous studies from the National Institutes of Health.
But a researcher involved in one of the studies that found no link between the virus and chronic fatigue says people who are using anti-viral drugs to deal with the syndrome should stop doing so. He says the drugs are "not totally harmless."
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