Bovine Leukemia Virus and Human Breast Cancer Risk

Holy Cow-Cancer! Scientists from the University of California – Berkeley compared the presence of bovine leukemia virus (BLV) in women with breast cancer to samples taken from women without breast cancer. They found BLV to be twice as common in the samples of women with breast cancer. Up until 2014, scientists didn’t believe BLV could be transmitted from cattle to humans, until they found it in humans.  BLV exists in dairy and beef cattle. The most recent dairy study found BLV present in nearly 84% of U.S. dairy operations.  Researchers stress that these findings do not prove that BLV causes breast cancer. They do suggest a breast cancer association ratio that is higher than other highly publicized risk factors, such as obesity and postmenopausal hormones. Read more here.


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