Health
The second type of avian influenza detected in dairy cows in the US
Nevada dairy cows are infected with a new type Bird flu This is different from the version that has spread to US herds since last year, USDA officials said Wednesday.
This detection indicates that a different form of virus, called type A H5N1, has spilled from wild birds to cows at least twice. Experts said they would raise new questions about the difficulty of controlling infection in animals and people who work closely with them, as well as the wider spread.
“I always thought that propagation from one bird to cow was a very rare event. Richard Webby, an influenza expert at St. Jude Children's Research Hospital, said: Masu.
The version of the H5N1 avian influenza virus known as B3.13 was confirmed in March after it was introduced into cattle in late 2023, scientists said. Over 950 people have been infected in 16 states. According to the USDA, the new version known as D1.1 was confirmed in Nevada cows on Friday. It was detected in milk collected as part of a surveillance program launched in December.
Angela Rasmussen, a virus expert at the University of Saskatchewan in Canada, identified the first spillover, said:
The D1.1 version of the virus was the type associated with the first US death linked to avian influenza and severe disease in Canada. Louisiana people He passed away in January After developing severe respiratory symptoms after contact with wild and inverted garden birds. In British Columbia The teenage girl was hospitalized for several months with the virus leading to poultry.
At least 67 people in the United States have contracted the avian flu, and those who work closely with dairy products and cattle, according to the U.S. Centers for Disease Control and Prevention.
USDA officials said they will post other information on new forms of the virus into a public repository later this week. Scientists said it is key to understanding whether spillover is a recent event, or whether the virus is likely to be widely circulating.
“If this turns out to be something that was passed on to a cow a few months ago, months are long before they don't detect it,” says Michael Warby, an evolutionary biologist who studied the H5N1 virus at the University of Arizona. Was told. cattle.
He added that it is important for the federal government to “share swift information about a virus that could cause a pandemic that could make Covid look like a walk around the park.”
“This is an important part of national security, global security, people, animals and the well-being of American businesses,” added Warby.
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The Associated Press School of Health Sciences is supported by the Howard Hughes Medical Institution's Science and Education Media Group and the Robert Wood Johnson Foundation. AP is solely responsible for all content.
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