For this reason, the team tracked immune system markers as well as the fatigue level of the patients before, during, and after treatment.
Researchers discovered that the immune response in those 18 people was higher than the rest of the patients, even before the beginning of the treatment.
“For the first time, we have shown that people who are prone to develop a CFS-like illness have an overactive immune system, both before and during a challenge to the immune system.
Our findings suggest that people who have an exaggerated immune response to a trigger may be more at risk of developing CFS,” lead researcher Dr Alice Russell said in a statement.
People living with CFS don’t exhibit any increase in immune response, supporting the hypothesis that the connection is at the beginning.
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