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    Created in 2008, Phoenix Rising is the largest and oldest forum dedicated to furthering the understanding of, and finding treatments for, complex chronic illnesses such as chronic fatigue syndrome (ME/CFS), fibromyalgia, long COVID, postural orthostatic tachycardia syndrome (POTS), mast cell activation syndrome (MCAS), and allied diseases.

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    Article: Looking Forward: Dr. Peterson on ME/CFS Research, Treatment Options and Hope for the Future

    I don't know whether the levels are comparable. I believe it can be very variable in ME/CFS. The reduced NK function in depression is thought to be one of the reasons it's a risk factor for cancer and probably in ME/CFS too.
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    Article: Looking Forward: Dr. Peterson on ME/CFS Research, Treatment Options and Hope for the Future

    Low NK cell activity is also associated with depression The problem with low NK cell activity, diagnostically, is that it is also associated with depression.