Usually I would just say I'm sick or not feeling well, because "chronic fatigue syndrome" seems to only humor them 
But when saying: "I have chronically active infection due to immunodeficiency" people seem to take it seriously!
This description fits to what cfs is in my case, but I think anyone with cfs can use it, because it's broad enough and fits to what cfs can be.
You could add that its "streptococcal" or any other infection that shows up in your tests!
Anyway, it's for general public, not infectionists/immunologists, hope it helps!
But when saying: "I have chronically active infection due to immunodeficiency" people seem to take it seriously!
This description fits to what cfs is in my case, but I think anyone with cfs can use it, because it's broad enough and fits to what cfs can be.
You could add that its "streptococcal" or any other infection that shows up in your tests!
Anyway, it's for general public, not infectionists/immunologists, hope it helps!
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