Second type of bird flu detected in US dairy cows

News

Second type of bird flu detected in US dairy cows

2025-02-06 08:42 Last Updated At：08:51

Dairy cattle in Nevada have been infected with a new type of bird flu that's different from the version that has spread in U.S. herds since last year, Agriculture Department officials said Wednesday.

The detection indicates that distinct forms of the virus known as Type A H5N1 have spilled over from wild birds into cattle at least twice. Experts said it raises new questions about wider spread and the difficulty of controlling infections in animals and the people who work closely with them.

“I always thought one bird-to-cow transmission was a very rare event. Seems that may not be the case,” said Richard Webby, an influenza expert at St. Jude Children’s Research Hospital.

A version of the H5N1 bird flu virus known as B3.13 was confirmed in March after being introduced to cattle in late 2023, scientists said. It has infected more than 950 herds in 16 states. The new version, known as D1.1, was confirmed in Nevada cattle on Friday, according to USDA. It was detected in milk collected as part of a surveillance program launched in December.

“Now we know why it's really important to test and continue testing,” said Angela Rasmussen, a virus expert at the University of Saskatchewan in Canada, who helped identify the first spillover.

The D1.1 version of the virus was the type linked to the first U.S. death tied to bird flu and a severe illness in Canada. A person in Louisiana died in January after developing severe respiratory symptoms following contact with wild and backyard birds. In British Columbia, a teen girl was hospitalized for months with a virus traced to poultry.

At least 67 people in the U.S. have been infected with bird flu, mostly those who work closely with dairy or cattle, according to the U.S. Centers for Disease Control and Prevention.

USDA officials said they would post genetic sequences and other information about the new form of the virus to a public repository later this week. Scientists said that would be key to understanding whether the spillover was a recent event or whether the virus has been circulating, perhaps widely, for longer.

“If this turns out to have been something that crossed into cattle a couple months ago, a couple months is a long time not to detect it,” said Michael Worobey, an evolutionary biologist at the University of Arizona who has studied the H5N1 virus in cattle.

He added that it's important for federal officials to share promptly information about a virus that has the potential to trigger a pandemic that could “make COVID seem like a walk in the park.”

“It's a vital part of national security, global security, the well-being of people, of animals and of businesses in the U.S.,” Worobey added.

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.

Dozens presumed dead and about 100 injured in fire at Swiss Alps bar during New Year's celebration

CRANS-MONTANA, Switzerland (AP) — Dozens of people are presumed dead and about 100 injured, most of them seriously, following a fire at a Swiss Alps bar during a New Year’s celebration, police said Thursday.

“Several tens of people” were killed at the bar, Le Constellation, Valais Canton police commander Frédéric Gisler said.

Work is underway to identify the victims and inform their families but “that will take time and for the time being it is premature to give you a more precise figure," Gisler said.

Beatrice Pilloud, attorney general of the Valais Canton, said it was too early to determine the cause of the fire. Experts have not yet been able to go inside the wreckage.

“At no moment is there a question of any kind of attack,” Pilloud said.

Officials called the blaze an “embrasement généralisé,” a firefighting term describing how a blaze can trigger the release of combustible gases that can then ignite violently and cause what English-speaking firefighters would call a flashover or a backdraft.

“This evening should have been a moment of celebration and coming together, but it turned into a nightmare,” said Mathias Rénard, head of the regional government.

The injured were so numerous that the intensive care unit and operating theater at the regional hospital quickly hit full capacity, Rénard said.

Helicopters and ambulances rushed to the scene to assist victims, including some from different countries, officials said.

“We are devastated,” Frédéric Gisler, commander of the Valais Cantonal police, said during a news conference.

The injured were so numerous that the intensive care unit and operating theater at the regional hospital quickly hit full capacity, according to regional councilor Mathias Rénard.

The municipality had banned New Year’s Eve fireworks due to lack of rainfall in the past month, according to its website.

In a region busy with tourists skiing on the slopes, the authorities have called on the local population to show caution in the coming days to avoid any accidents that could require medical resources that are already overwhelmed.

The community is in the heart of the Swiss Alps, just 40 kilometers (25 miles) north of the Matterhorn, one of the most famous Alpine peaks, and 130 kilometers (81 miles) south of Zurich.

The highest point of Crans-Montana, with a population of 10,000 residents, sits at an elevation of nearly 3,000 meters (1.86 miles), according to the municipality’s website, which says officials are seeking to move away from a tourist culture and attract high-tech research and development.

The municipality was formed only nine years ago, on Jan. 1, 2017, when multiple towns merged. It extends over 590 hectares (2.3 square miles) from the Rhône Valley to the Plaine Morte glacier.

Crans-Montana is one of the top race venues on the World Cup circuit in Alpine skiing and will host the next world championships over two weeks in February 2027.

In four weeks’ time, the resort will host the best men’s and women’s downhill racers for their last events before going to the Milan Cortina Olympics, which open Feb. 6.

Crans-Montana also is a premium venue in international golf. The Crans-sur-Sierre club stages the European Masters each August on a picturesque course with stunning mountains views.