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Speaking of parasites -- that's another possible trigger or contributing factor -- a parasite infection -- that is often overlooked when treating CFS/ME. Thanks Eric! 
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Lack of Detection of XMRV in Seminal Plasma from HIV-1 Infected Men in The Netherland
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I agree, it's possible. I was using 'parasites' in the broad sense, though, which embraces everything which parasitizes. Unfortunately there are two very different senses.
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Cort, hm now that I think about it I've heard that CFS isn't too common in spouses. Still, I've seen nothing formal.
Anyway CFS does run in families to an extent. It could be that some study has found a heritability of zero but what I have seen is more like 0.30.
Anyway CFS does run in families to an extent. It could be that some study has found a heritability of zero but what I have seen is more like 0.30.
Another thought. It's clear that the WPI are working with the idea of cofactors as triggers for XMRV to turn into CFS. What if the order in which people get these viruses or other life events is important?
eg. I got CFS at age 37 after a bout of EBV. But my mother has fibromyalgia, father just died of prostate cancer, mums father died of prostate cancer and her youngest brother has just been diagnosed with it. Based on the current WPI hypothesis, if I had to guess, I'd say I was probably carrying XMRV all my life causing no harm until I got EBV.
But what about a scenario where someone has EBV as a child, is thus immune, then later contracts XMRV? Maybe they would be OK and could be a carrier with one less thing that can convet XMRV to CFS?
eg. I got CFS at age 37 after a bout of EBV. But my mother has fibromyalgia, father just died of prostate cancer, mums father died of prostate cancer and her youngest brother has just been diagnosed with it. Based on the current WPI hypothesis, if I had to guess, I'd say I was probably carrying XMRV all my life causing no harm until I got EBV.
But what about a scenario where someone has EBV as a child, is thus immune, then later contracts XMRV? Maybe they would be OK and could be a carrier with one less thing that can convet XMRV to CFS?
I will repost the idea on the undestanding that it is just speculation.
The thought was if XMRV was spread through blood transfusion then mothers giving birth would be prime recipients of the virus and they then go on to breastfeed their children (perhaps when they are most infectious?). This could explain both sporadic occurrences and patterns within families. Because CFS might occur a long time after XMRV infection no one would ever pick it up as an epedemic. But the drawback I see to this idea is that we don't hear of heamopheliacs coming down with CFS. Also it doesn't really explain outbreaks either.
I only came to this thought after I found out how many of my friend have received a transfusion during chilbirth (quite a lot). On the weekend I found out from my own mother that she had one when I was born.
The thought was if XMRV was spread through blood transfusion then mothers giving birth would be prime recipients of the virus and they then go on to breastfeed their children (perhaps when they are most infectious?). This could explain both sporadic occurrences and patterns within families. Because CFS might occur a long time after XMRV infection no one would ever pick it up as an epedemic. But the drawback I see to this idea is that we don't hear of heamopheliacs coming down with CFS. Also it doesn't really explain outbreaks either.
I only came to this thought after I found out how many of my friend have received a transfusion during chilbirth (quite a lot). On the weekend I found out from my own mother that she had one when I was born.
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I actually deleted mine too, they were getting pretty complicated and speculative.
lol!, I'll just leave mine now.
I guess I'm now thinking that the take home message from all this might be that working out the epidemiology of a virus like XMRV based on CFS symptoms would be almost impossible for mere mortals like us if the following things are true:
* that XMRV has cofectors as triggers to bring on illness
* there is delayed onset of many years after infection
* conversion from latent carrier to CFS symptoms is not inevitable (as with AIDS in most cases)
I guess I'm now thinking that the take home message from all this might be that working out the epidemiology of a virus like XMRV based on CFS symptoms would be almost impossible for mere mortals like us if the following things are true:
* that XMRV has cofectors as triggers to bring on illness
* there is delayed onset of many years after infection
* conversion from latent carrier to CFS symptoms is not inevitable (as with AIDS in most cases)
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Perhaps not persuasive. But a fact.
They wrote:
This is simply not true. So either they are competent but they decided to lie, or they are incompetent.
They wrote:
This is simply not true. So either they are competent but they decided to lie, or they are incompetent.
I realise you said if, so this is only about the idea. Simply we have no idea yet if those people with XMRV and no symptoms will develop disease. As for heamopheliacs , we don't hear about who does get CFS. Unless you count the CDC, and who does. They cannot tell us who gets the disease, because they either have not looked, or everyone can. There will be other options, but I'm saying that we don't know if heamopheliacs have been developing CFS or prostate cancer. Why would they look, when they don't take the disease seriously?
There's a post on the Virology blog about this study. Not sure if it was mentioned in this thread already. The conclusions kinda rip apart the study...
http://www.virology.ws/2010/08/13/xmrv-not-detected-in-seminal-plasma/#comments
http://www.virology.ws/2010/08/13/xmrv-not-detected-in-seminal-plasma/#comments
Thanks for the link. That post must have just gone up, as it's dated today.
Vincent Racaniello, as usual, cuts to the chase.
Vincent Racaniello, as usual, cuts to the chase.
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Is it my imagination, or is Prof. Racaniello losing patience with sloppy science on XMRV?
The idea of checking in some way that some subjects were infected with XMRV before checking semen seems pretty obvious. The treatment of samples prior to PCR simply doesn't make a whole lot of sense to me. Can anyone tell me what they might have been thinking?
The problem here is that there is a great deal of bad work out there to emulate. Researchers with limited budgets may simply choose to do what they can afford, if it is has been used in published papers. Bad science acts like Gresham's law for money.
The idea of checking in some way that some subjects were infected with XMRV before checking semen seems pretty obvious. The treatment of samples prior to PCR simply doesn't make a whole lot of sense to me. Can anyone tell me what they might have been thinking?
The problem here is that there is a great deal of bad work out there to emulate. Researchers with limited budgets may simply choose to do what they can afford, if it is has been used in published papers. Bad science acts like Gresham's law for money.
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Agreed. A cool, level-headed analysis of the methodological limitations of the study.
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Did anyone establish if madmax (a member of PR) is in fact Max A. Pfost of the WPI? The Virulence paper Professor Racaniello links to remains uncorrected (*).
(*) See: http://www.forums.aboutmecfs.org/sh...fectious-Agent&p=106173&viewfull=1#post106173
ETA: but yes, it's good to see he is aware of the importance of co-culture in LNCap cells.
(*) See: http://www.forums.aboutmecfs.org/sh...fectious-Agent&p=106173&viewfull=1#post106173
ETA: but yes, it's good to see he is aware of the importance of co-culture in LNCap cells.
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Thanks, Otis. I searched PR and found that knackered had been in email correspondence with madmax and was satisfied that he was Max Pfost. I'm still concerned tho' that the paper has not been removed from the website to allow the WPI to amend it. I would guess this results from the WPI team being overworked and understaffed.
ETA: Otis, I note your updated avatar and conclude you have very fine taste in music.
ETA: Otis, I note your updated avatar and conclude you have very fine taste in music.
From Vincent Racaniello's blog:
Yes! I wish they would quit wasting resources on meaningless studies.
I think I'm becoming a Vincent Racaniello groupie. His TWIV podcasts are giving me a quick course in virology 101. A lot of it doesn't make it through the brain fog, but enough does that I'm understanding the studies I read better. And I find it soothing to listen to.
Yes! I wish they would quit wasting resources on meaningless studies.
I think I'm becoming a Vincent Racaniello groupie. His TWIV podcasts are giving me a quick course in virology 101. A lot of it doesn't make it through the brain fog, but enough does that I'm understanding the studies I read better. And I find it soothing to listen to.