The new strain of bird influenza-H5N9 was detected in Mercedo County, California in a commercial duck operation.
According to the animal hygiene agencies, which is an international consortium for medical care, veterinarians, and wildlife experts, the duck test is infected with both H5N1 and H5N9 shares on farms, according to the animal hygiene agency, an international consortium for veterinarians and wildlife experts. I showed that.
“The incident is both unexpected or surprising,” said Annette Jones, a veterinarian in California.
The new strain is a combination of H5N1 strains widely detected around the world and perhaps “low -disease” bird influenza virus, like a mild virus that moves birds without killing birds. A biologist at Recombinomics Inc., a virus and vaccine research company in Pittsburg.
“This is a new serum type that the N1 segment is replaced by N9,” he said.
Influenza virus is composed of eight segments, including hemagle chininton proteins, “H” of viruses, nerminidase, or “n”. If the animal is infected with two different influenza viruses, two genetic substances can be switched or re -formed to form a new version. This is probably what happened here. The host -the same part -to -new neura minidase -the part that helps release viruses from infected cells- has been replaced.
Fortunately, World Health Organization, Richard Webby, stated that the combination of commercial ducks is unlikely to increase the possibility of human pandemic. Webby, the director of the animals and bird research center of the WHO’S COLLABORATING CENTER FOR NOVERS OF THE ENFLENZA, this virus is more human health than the current H5N1 stocks that are circulating dairy cows, commercial poultry, and wild animals. He said it was not a big threat.
However, there was a genetic re -agreement between H5n1 and human seasonal influenza, which could be a problem.
Such a combination may provide bird flu with the necessary equipment to pass through people more easily and efficiently.
“We know that this virus will be re -divided again. Former USDA scientists, John Course Land, use researchers to make virus more fatal and infectious. In mention of experiments, nature is a huge functional acquisition experiment. ”
So far, there was no evidence that one of the bird influenza virus stocks currently circulating in North America has gained such abilities.
According to the Disease Control Prevention Center, 67 US people are infected with H5N1 bird flu. One died. In most cases, it is related to occupational exposure through infected dairy cows and poultry. In three cases, the source remains unidentified.
Niman said that the H5 family circulating in North America has four bird influenza virus. Two are part of H5N1 stocks. One of them, H5N1 B3.13, is mainly found in dairy cows and dairy workers. Another H5N1, known as D1.1, has a significant effect on wild birds and commercial poultry. It is also a virus version that killed Louisiana people and severely ill -illnessed the British Columbian teenager.
Next, there is H5N2, which is distributed in British Colombia. It also resolves the H5n1 virus with another bird influenza virus. It was first discovered in November 2024 and was detected with at least two commercial poultry work.
Currently, according to the US Ministry of Agriculture, there is H5N9, which has been detected only in Mercedo County, and has conducted an inspection and genetic sequence.
“This is the first confirmed case of HPAI (highly pathogenic bird influenza) H5N9 in US poultry,” USDA stated in a world organization for animal health. “USDA Animal and Plant Health Inspection Service (APHIS) has been conducting comprehensive epidemiological surveys and strengthening monitoring in cooperation with state animal health and wildlife officials. Masu.”
This virus was detected in the duck firm in late November. All ducks -about 119,000 birds -euthanized by December 2.
Webby said that the virus was wiped out in the poultry surgery. There were no reports of other commercial operations or wild birds.
So far, there is no human report infected with H5N9.
“Overview: This is not a surprising surprise because there are multiple circulating bird influenza viruses,” said Maurice Pizzky, an associate professor who studies UC Davis poultry health and food safety epidemics. Ta. Nevertheless, researchers need a more robust surveillance system that provides information about “places where waterfielders are and places that HPAI are likely to exist in wild birds compared to commercial facilities.”
“As part of the ongoing test strategy, the Agricultural Bureau and USDA will continue to monitor new or unusual viruses,” said the Agricultural Bureau and USDA.
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