As a side point, quite a few years ago I tried to interest a local pathology group to look at a hydrogen sulphide test. No interest. I am not convinced hydrogen sulphide is the cause, or even a cause. I am convinced there is enough there to investigate further. What is very likely though is that hydrogen sulphide is an important contributing factor. For that alone it needs to be investigated. I would like to reiterate that most pathogens implicated in triggering ME can infect both gut and B cells. This is probably important.