In Vitro Infidelium
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IVI, your argument re the gender issues has weaknesses.
You are overlooking a number of different reasons why women could become ill, but men not become ill, when exposed to the same pathogen.
1. If a virus is sexually transmitted, there could be a reason why women are more vulnerable to infection than men.
2. People who are infected with HIV do not necessarily show any signs of illness, or have any symptoms. So it is possible that an equal amount of men and women are infected with a retrovirus (e.g. an HGRV) but that women are more likely to become ill. One such reason could be that the virus is stimulated or reacts in some way to female hormones. Or another reason could be that there is some tissue unique to females that the virus thrives in. Remember the macaque study, and how XMRV seems to prefer tissue to blood. I think there has been some research, or at least a hypothesis, about why XMRV might be stimulated by hormones, but I'm afraid that I can't remember the details.
One can come up with ever more sophisticated propositions, but the question in science is whether these propositions are independently testable. Gender differences resulting from sexual transmission is just a variation in exposure - it was precisely the point I made in response to Redo rgarding HIV - in the 1980s and 90s in the US, gay men were identified as especially prone - from the late 1990s onwards it's been recognised that women in developing countries are at higher risk. In neither case was/is HIV making a choice about who to infect - it's simply a matter of exposure. Unless a pathogen is ubiquitous, patterns of exposure are easily identifiable - where are the patterns in M.E/CFS ? It doesn't affect any given geographical area with any consistency, it has no social or cultural preference, and apart from a certain age disaprity, in rather the wrong direction (cf. adolescent diseases -HIB, EBV etc) the only notable demograhic charateristic is the gender differential. Of course there may be hidden epidemiological issues - but we have to progress from what we know, not from what maybe.
The value of an hypothesis is whether or not it is testable - simply coming up with a list of things that help lever a proposition into a conception that fits a preferred perspective will not produce a testable hypothesis. HGRVs are no doubt very worthy of scientific enquiry, what no one has at present is any testable hypothesis about why any given HGRV should be associated with M.E/CFS any more than any other pathogen. There is no basis therefore to make a choice of what to look for or why ? Or even what it might possibly mean when you find what you are looking for. The whole XMRV fiasco (OK it was a great reminder to researchers that they need to be careful when arriving at conclusions - prior plausibility rules !) has not even come close to even asking the question about disease causation - all that time, all that expense and it was just a fishing trip. How many more blind fishing trips will this kind of approach take to come up with something useful ? Monkeys, typewriters, the works of Shakespear and an infinte amount of time, suggest themelves as some how relevant.
IVI