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Virus in Cattle Linked to Human Breast Cancer

Published

11 years ago

September 15, 2015

By Sarah Yang, UC Berkeley News

A new study by UC Berkeley researchers establishes for the first time a link between infection with the bovine leukemia virus and human breast cancer.

In the study, published this month in the journal PLOS ONE and available online, researchers analyzed breast tissue from 239 women for the presence of bovine leukemia virus (BLV), comparing samples from women who had breast cancer with women who had no history of the disease.

They found that 59 percent of breast cancer samples had evidence of exposure to BLV, as determined by the presence of viral DNA. By contrast, 29 percent of the tissue samples from women who never had breast cancer showed exposure to BLV.

“The association between BLV infection and breast cancer was surprising to many previous reviewers of the study, but it’s important to note that our results do not prove that the virus causes cancer,” said study lead author Gertrude Buehring, a professor of virology in the Division of Infectious Diseases and Vaccinology at UC Berkeley’s School of Public Health.

“However, this is the most important first step,” said Buehring. “We still need to confirm that the infection with the virus happened before, not after, breast cancer developed, and if so, how.”

Bovine leukemia virus infects dairy and beef cattle’s blood cells and mammary tissue. The retrovirus is easily transmitted among cattle primarily through infected blood and milk, but it only causes disease in fewer than 5 percent of infected animals.

A 2007 U.S. Department of Agriculture survey of bulk milk tanks found that 100 percent of dairy operations with large herds of 500 or more cows tested positive for BLV antibodies.

This may not be surprising since milk from one infected cow is mixed in with others. Even dairy operations with small herds of fewer than 100 cows tested positive for BLV 83 percent of the time.

What had been unclear until recently is whether the virus could be found in humans, something that was confirmed in a study led by Buehring and published last year in Emerging Infectious Diseases. That paper overturned a long-held belief that the virus could not be transmitted to humans.

“Studies done in the 1970s failed to detect evidence of human infection with BLV,” said Buehring. “The tests we have now are more sensitive, but it was still hard to overturn the established dogma that BLV was not transmissible to humans. As a result, there has been little incentive for the cattle industry to set up procedures to contain the spread of the virus.”

The new paper takes the earlier findings a step further by showing a higher likelihood of the presence of BLV in breast cancer tissue. When the data was analyzed statistically, the odds of having breast cancer if BLV were present was 3.1 times greater than if BLV was absent.

“This odds ratio is higher than any of the frequently publicized risk factors for breast cancer, such as obesity, alcohol consumption and use of post-menopausal hormones,” said Buehring.

There is precedence for viral origins of cancer. Hepatitis B virus is known to cause liver cancer, and the human papillomavirus can lead to cervical and anal cancers. Notably, vaccines have been developed for both those viruses and are routinely used to prevent the cancers associated with them.

“If BLV were proven to be a cause of breast cancer, it could change the way we currently look at breast cancer control,” said Buehring. “It could shift the emphasis to prevention of breast cancer, rather than trying to cure or control it after it has already occurred.”

Buehring emphasized that this study does not identify how the virus infected the breast tissue samples in their study. The virus could have come through the consumption of unpasteurized milk or undercooked meat, or it could have been transmitted by other humans.

The University of California Breast Cancer Research Program and the U.S. Department of Defense Breast Cancer Research Program helped support this research

Oakland Post

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New Protections for Ticket Buyers: Gov. Newsom Signs Assemblymember Isaac Bryan’s Bill

OAKLAND POST — Assembly Bill 1349 expands state regulation of original ticket sellers, resellers and online resale marketplaces. The law targets deceptive sales practices, ticket-buying software and speculative listings — tickets advertised for sale by sellers who do not possess them or have authorization to sell them.

Published

6 days ago

October 4, 2026

Post News Group

Assemblymember Isaac Bryan (D-Ladera Heights). File photo.

By California Black Media Staff

Gov. Gavin Newsom signed legislation on Sept. 27 authored by Assemblymember Isaac Bryan (D-Ladera Heights) that strengthens consumer protections for Californians purchasing tickets to concerts, sporting events and other live entertainment.

Assembly Bill 1349 expands state regulation of original ticket sellers, resellers and online resale marketplaces. The law targets deceptive sales practices, ticket-buying software and speculative listings — tickets advertised for sale by sellers who do not possess them or have authorization to sell them.

“Buying a ticket shouldn’t come with hidden risks or unfair practices,” Newsom wrote on social media after signing the measure.

Under AB 1349, ticket sellers are prohibited from listing tickets before they have been officially released unless they have authorization or a legally enforceable right to receive them. Online marketplaces must also take reasonable steps to prevent speculative ticket sales on their platforms.

The law prohibits sellers from using bots, multiple accounts, email addresses or internet protocol addresses to circumvent ticket limits, presale restrictions, electronic queues and other controls. It also bans websites and advertisements designed to mislead buyers into believing they are purchasing tickets from an authorized seller, venue or event organizer.

Sellers who violate certain provisions and fail to provide a promised ticket may be held liable for twice the ticket’s contracted price. Buyers may also recover nonrefundable expenses incurred while attempting to attend an event, along with reasonable attorney’s fees and court costs.

Pastor Tecoy Porter Sr., president of the National Action Network’s Sacramento chapter, said the law establishes needed accountability.

“Buying a ticket to a concert or show shouldn’t mean entering a marketplace where the rules are stacked against you. This year, we worked with a coalition of consumers, civil rights advocates, community groups, and businesses to make AB 1349 stronger. Consumers deserve enforceable rules that protect them. We thank Assemblymember Bryan for his leadership, and we will keep working to make ticketing fair for every Californian.”

Jose L. Barrera, national vice president for the Far West Region of the League of United Latin American Citizens, also praised the measure.

“Californian families deserve certain protections when they buy tickets. Assemblymember Bryan listened to communities across California and delivered a bill that puts fans first. We thank him and Governor Newsom for making it law.”

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Zakiya Jendayi Arrested, Locked Out of Home by Sheriff’s Deputies

OALAND POST — On Tuesday, deputies followed Jendayi as she left her residence of 13 years to file documents in her case at the Appellate Court. Deputies arrested her upon arrival and transported her to Santa Rita Jail.

Published

6 days ago

October 4, 2026

Post News Group

By Tanya Dennis

Yesterday, more than 10 Alameda County Sheriff’s deputies arrived to take possession of Zakiya Jendayi’s home on behalf of a court-appointed administrator. Jendayi was arrested at the courthouse and transported to Santa Rita Jail around the same time.

Jendayi, who has been embroiled in a probate court battle to retain the inheritance bestowed on her by a longtime friend and colleague who passed away in 2013, had received a notice of eviction last month.

With help from neighbors, friends and clergy, she was able to fend off the eviction from 3614 Randolph Ave. in Oakland and even obtained a reprieve when her bid to file bankruptcy was approved by a county court.

But Philip Campbell, the court-appointed administrator, had already placed Jendayi’s home in his name in October 2025.

On Tuesday, deputies followed Jendayi when she left her residence of 13 years to go to the Appellate Court to file documents in her case. Deputies arrested her upon arrival and transported her to Santa Rita jail.

Undersheriff April Luckett-Fahini said Jendayi was arrested for “safety reasons.” At this time, it is unknown what charges were used for the arrest.

In Jendayi’s absence, Campbell came to her residence accompanied by deputies, had the property taped off with yellow crime tape, and had the locks changed.

Afterward, Campbell requested a police escort to his car amid several angry neighbors who had been advocating that officials pause the eviction pending Jendayi’s appeal.

“Zakiya Jendayi is a respected Black elder in our community,” said Alameda County Supervisor Nikki Fortunato Bas, who has been working with Jendayi to prevent her eviction. “It’s outrageous that she was arrested. There needs to be more justice and equity in our probate system.”

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Ask California: Golden State Releases New AI Chatbot

Gov. Gavin Newsom introduced the prototype as part of the state’s broader effort to use artificial intelligence to make government services easier to access. The launch follows his March 2026 executive order directing state agencies to responsibly implement generative AI while protecting privacy, security and civil liberties.

Published

3 weeks ago

September 22, 2026

Post News Group

By Bo Tefu, California Black Media

California has launched AskCA, a new artificial intelligence-powered chatbot designed to help residents find and navigate state and local government services through a single online platform.

Developed by the state’s Office of Data and Innovation, AskCA is designed around major life events rather than individual government agencies. Californians can use the tool to find information about finding a job, starting a business, accessing family services and recovering from disasters.

“When a Californian needs help, they shouldn’t have to become an expert in government to find it,” said Newsom. “We’re using the best technology California has to offer to make the government more efficient, effective, and more engaged.”

The state is now seeking Californians age 18 and older to participate in the pilot and help test and refine AskCA’s responses. Officials said subject matter experts across state governments are helping inform the chatbot’s answers, which are designed to draw from verified government sources and provide actionable information.

The prototype grew out of California’s response to the January 2025 Los Angeles wildfires. Early testing included more than 140 fire recovery leaders and Altadena wildfire survivors, a dozen job seekers and more than 100 general users.

Jeffery Marino, director of the Office of Data and Innovation, said the tool is intended to remove the need for residents to understand how government agencies are organized before they can get help.

“Californians should not have to understand how the government is organized just to get basic help,” Marino said.

AskCA’s technology will also be used in a new job-skills matching feature that the California Department of Human Resources plans to launch Sept. 30 on CalCareers. Job seekers will be able to upload a resume and receive potential matches to state job classifications.

The state said the CalCareers pilot will not store personal information or require users to have a CalCareers account. California plans to continue testing AskCA as officials evaluate its accuracy, performance and usefulness before expanding the system.