It's looking like <some stressful assault on the body's immune system> is a necessary but not sufficient condition to developing CFS. Further, there are many ev

It's looking like <some stressful assault on the body's immune system> is a necessary but not sufficient condition to developing CFS. Further, there are many events which can serve as triggers. But in the cases where the other prerequisite conditions are met, EBV is usually the causal trigger.