As much as 20 p.c of all cancers normally are linked to infections, notably viruses, and the listing of probably carcinogenic infectious brokers is rising. It might be nice if we might discover a virus that contributed to breast most cancers danger, as a result of then we would have new methods to stop and deal with it. At the moment, the dietary hyperlink between breast most cancers and consumption of meat and dairy is taken into account a saturated fats impact, however there’s a cancer-causing bovine virus that infects the mammary gland cells of cows. The infectious virus is then launched into the milk provide. Since most U.S. dairy herds are contaminated, scientists posit that People are sometimes uncovered to this bovine leukemia virus (BLV), which I focus on in my video The Function of Bovine Leukemia Virus in Breast Most cancers.
We didn’t have proof of this till 2003, 34 years after the virus was first recognized. Early on, our greatest out there exams failed to search out antibodies to BLV in human blood. When our immune system is uncovered to a virus, it creates antibodies to assault it. No antibodies, no publicity. “This led to the prevailing opinion that…the virus is just not a public well being hazard.” Although these exams “had been state-of-the-art at the moment, they’re extraordinarily insensitive in comparison with extra trendy strategies.” In consequence, researchers determined to re-examine the problem now that we’ve higher exams. They took blood from about 250 individuals merely to handle the query: “Do any people have antibodies to BLV?” The reply? Sure, 191 of them did––74 p.c. That shouldn’t have come as a shock, nevertheless: By then, almost 90 p.c of American dairy herds had been contaminated, and, based on the most recent nationwide survey, 100 p.c of the massive manufacturing facility dairy farms had been contaminated, as decided by testing the milk coming from these operations. Given this, why isn’t there an epidemic of most cancers of the udder? Dairy cattle are slaughtered so younger that there isn’t a variety of time for them to develop gross tumors, however that’s how most ladies could also be getting contaminated. Though pasteurization ought to knock out the virus, who hasn’t eaten a uncommon, pink-in-the-middle burger in some unspecified time in the future?
The underside line is that the “long-held assumption that BLV is just not a public well being hazard…is not tenable…” This entire area of investigation must be reopened, with the subsequent step figuring out whether or not people are literally contaminated. “The presence of antibodies to specific viruses in human sera is mostly interpreted as an indicator of a gift or previous an infection with the virus.” However, theoretically, we would have developed antibodies to the useless viruses we ate, viruses that had been killed by cooking or pasteurization. Simply because three-quarters of us have been uncovered doesn’t imply we had been actively contaminated by the virus.
How can we show this? We would wish to search out the retrovirus actively stitched into our personal DNA. Properly, thousands and thousands of ladies have had breast surgical procedure, so why not simply have a look at the tissue? Researchers lastly did simply that and revealed their findings within the Facilities for Illness Management and Safety’s rising infectious illnesses journal: Forty-four p.c of samples examined optimistic for BLV, proving for the primary time that people might be contaminated with bovine leukemia virus. The ultimate step? Decide whether or not the virus is definitely contributing to illness. In different phrases, are the bovine leukemia viruses we’re discovering in human breast tissue cancer-causing or simply “innocent passengers”?
One technique to make that dedication is to see whether or not the virus is extra usually current in these with breast most cancers. Nobody had ever seemed for the virus in breast tissue from individuals with most cancers…till now. The “[p]resence of BLV-DNA in breast tissues was strongly related to identified and histologically confirmed breast most cancers…” As many as 37 p.c of human breast most cancers instances could also be attributable to publicity to bovine leukemia virus.
For some historic background main as much as these stunning findings, see my video Is Bovine Leukemia Virus in Milk Infectious?.
I couldn’t wait to learn the meat and dairy trade journals to see how they’d attempt to spin this. Discover out what I found in my last video on this sequence Trade Response to Bovine Leukemia Virus in Breast Most cancers.
In well being,
Michael Greger, M.D.
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