Examine the role the Eta-1/Op gene may play in uncovering the cause of CFS Current research indicates that chronic fatigue syndrome may have an infectious etiology and that genetic factors might determine a body's ability to overcome or fall victim to a chronic infection. Chronic Fatigue Syndrome, Genes, and Infection: The Eta-1/Op Paradigm focuses on the Early T lymphocyte activation-1/osteopontin gene (Eta-1/Op), a cytokine that offers natural resistance...