For many years, scientists have been looking for an explanation to characterize a condition that they termed Chronic Fatigue Syndrome (CFS). Basically, people suffering from it are very tired all the time, and also exhibit a host of other symptoms for which doctors can find no biological explanation. Last year, a research group proposed that the condition might be linked to a viral agent, but now a new study shows that the link does not hold up against rigorous, scientific scrutiny, ScienceNow reports.