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Since the cause of the illness is not known, the question of contagion is n= ot known. Many studies suggest that there is no correlation between CFS and casual or= intimate contact. On the other hand, there are infrequent but occasional reports of = cluster outbreaks of CFS. How that can happen, while at the same time in other inst= ances intimate family members do not pass on the disease, remains one of the myst= eries of this illness.