Attachment to IACFS/ME Newsletter
Q: It has been said in the new paper article that XMRV is transmitted by blood, sex and body fluid. The author
may have meant that this is what happens in mice but is not yet defined for human. Sexual transmission (men
who have sex with men) and transmission through blood (hemophiliacs) were long suspected based on
epidemiologic data before HIV was found to be cause of AIDS in 1984. ME/CFS does not have typical pattern
of sexual transmission although there are rare mentions of transmission between couples. Most of my patients
have developed ME/CFS after flu-like illness with respiratory and/or gastrointestinal symptoms, which would
speak against sexual and blood transmission. Furthermore, why are children developing this illness and why
clusters of cases occurred in Incline village and other areas, if the transmission is as stated. Please clarify this
issue.
Thank you,
John K. Chia M.D.
A: Newspapers are notorious for extrapolating data and drawing conclusions. We and Dr. Stuart Legrice
attempted several times in writing to correct the mis-statements in the Wall Street journal and the NY Times.
The Science paper showed that XMRV was blood borne, infectious and transmissable SUGGESTING blood
and body fluid transmission although NO studies have proven transmission of any kind. The authors meant
this is the mode of transmission for the other two human exogenous retroviruses HTLV-1 and HIV. XMRV is
NOT a Mouse virus and NO ONE knows how it got into the human population). This author has never worked
with mice.
It is important NOT to think only of HIV when considering modes of transmission. Body fluid means ANY body
fluid, blood was proven in the Science paper, but one can also consider saliva, vomit, urine and feces. XMRV
is a gammaretrovirus (simple) and these tend to be much more stable than HIV and HTLV1 which are complex
retroviruses. XMRV has been demonstrated by us in the science paper to be very stable and easily
transmissable CELL Free unlike its cousins HTLV (which is tightly cell associated) and HIV, which is very labile
and not stable in vomit feces or urine and while it can be shed and theoretically transmitted in saliva this is rare
as it is labile cell free as well.. the flu like illness and gastrointestinal issues are consistent with stability in other
body fluids and particularly in acidic environments such as the gut and urineWe have isolated infectious
XMRV from saliva and prostatic secretions to date and tested its stability. These are unpublished data and we
await the development of a quantitative viral load assay, but when we can quantify the stability, my hypothesis
is that XMRV is the most stable human retrovirus to date and while no human retrovirus (or animal retrovirus is
transmitted airborne) our hypothesis is that we will find the transmission is in other body fluids and outbreaks
occur because of the stability of XMRV in other body fluids
Q: How would teachers in the same school, for example (who were not misbehaving), contract the disease from each other?
A: See above but what if XMRV is more stable in body fluids such as saliva, urine, vomit such that exchange of body fluids less directly than sexual contact and blood borne direct infection were the mode of transmission. This hypotheses would satisfy the familial and close contact such as a school particularly if a co-pathogen enhanced transmission and progression as was the case of HIV and HSV in Africa.