Health
Cows have a second form of avian influenza
Nevada dairy cows have contracted a new form of avian flu, which is different from the versions that have spread throughout the herd last year. The US Department of Agriculture announced on wednesday.
The findings show that a virus known as H5N1 has spilled from birds to cows at least twice. It also suggests that the virus can pose a lasting risk to cattle and those who work closely with them.
Before last year, scientists didn't know that cows were susceptible to this type of flu.
“This isn't something everyone wants to see,” said Louise Monkra, an evolutionary biologist studying avian flu at the University of Pennsylvania. “We need to consider the possibility that cows may be more susceptible to these viruses than we originally thought.”
The news was announced in a news release from Animal and Plant Health Inspection Service, a division of the Department of Agriculture. Federal agencies have not given news briefings on the avian flu since President Trump took office.
The virus spreading in the country's dairy products is a version of H5N1 known as B3.13, which is infected A group of over 950 people In 16 states. Scientists believe that somewhere in the Texas Panhandle, they first jumped from birds to cows about a year ago. That transition surprised scientists, and even more so for this new one.
“We believed that the bird-to-cow movement was a rather rare event,” says Richard Webby, an influenza expert at St. Jude Children's Research Hospital.
The fact that it happened again is “a little 'amazing' for me,” he added.
Nevada cattle have been infected with a version of the virus known as d1.1, which has spread to wild birds and poultry. Initially it was detected in milk collected from silos. National Breast Examination Strategy It was announced by the USDA at the end of last year.
The D1.1 format of H5N1 also shows that it is dangerous to people. Of the 67 Americans known to have been ill with H5N1 so far, only the ones who died were infected with this version. The Louisiana resident, age 65 or older, cared for sick and dying birds. He passed away in early January.
In November, a 13-year-old Canadian girl also contracted the D1.1 virus, but it is unclear where she acquired it. Her only risk factor was obesity, but she also became seriously ill. It is placed on life support Due to organ failure. She eventually recovered.
Avian influenza is called that because it is the best thing to infect birds. However, in both of these, the virus can acquire mutations in the course of infection, allowing people to infect.
“We've seen a lot of fun and hard work,” said Scott Hensley, an immunologist at the University of Pennsylvania.
Encouragingly, the virus seemed to have not spread to other people either. Yet, its evolution showed that it could acquire the ability to spread efficiently among people.
So far, at least the spread of D1.1 to cows “will not change the average person's life,” Dr. Monca said. But it poses risks to dairy workers and the dairy industry, experts said. It also suggests that the patient may have already been infected once on b.3.13 could lead to the disease a second time with D1.1, Dr. Webby said.
“It's not another virus,” he said. “This suggests that for me it will become a prolonged issue.”
Since January 2022, there has been a H5N1. Detected Viruses are affected in wild aquatic birds in the US Over 153 million It brings record prices for commercial, backyards, wild birds and eggs.
It also attacked dozens of mammal species, including wild and domesticated cats, raccoons, bears and sea lions.
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Sources 2/ https://www.nytimes.com/2025/02/05/health/bird-flu-cattle-d11.html The mention sources can contact us to remove/changing this article |
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