Bird flu suspected in four Washington farm workers, CDC sends team

By Tom Polansek

October 21, 20241:59 PM PDTUpdated a day ago

Illustration shows test tube labelled "Bird Flu", eggs and U.S. flag

CHICAGO, Oct 21 (Reuters) – The CDC is deploying a team to Washington state to assess the health of farm workers who culled poultry suffering from bird flu after four workers are presumed to have been infected by the virus, U.S. and state health officials said on Monday.

The infections would make Washington the sixth state to identify human cases this year.

The cases fuel growing concern among public health experts, as infections of U.S. dairy cattle and more than two dozen farm workers have worried scientists and federal officials about the risks to humans.

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California and Washington have said they are seeking to administer seasonal flu vaccines to farm workers to reduce their risk of being infected with both bird flu and seasonal influenza.

Infections with both types of virus simultaneously could increase the risk of changes that could make bird flu spread more easily in people and potentially cause a pandemic, virologists say.

“We don’t have evidence yet of transmission between people,” said Roberto Bonaccorso, spokesperson for the Washington State Department of Health.

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The Centers for Disease Control and Prevention is awaiting specimens for testing from Washington and sending a team to support the state’s assessment of farm workers, an agency spokesperson said. The risk to the public from the outbreak in cattle remains low, but those with exposure to infected animals are at heightened risk, according to the CDC.

The four tested presumptively positive after working at an infected egg farm, Washington’s health department said, adding their use of protective gear was inconsistent. The workers suffered mild respiratory symptoms and conjunctivitis, and were given antiviral medication, officials said.

The workers were removing carcasses and litter and cleaning facilities where about 800,000 chickens were culled, the health department said. The farm was hit by a strain of the virus from wild birds, according to Washington’s agriculture department.

Nationwide, 27 people had tested positive for the virus in 2024 before the cases in Washington. All but one had known exposure to infected poultry or dairy cattle.

Nearly 2 million chickens must be killed in Utah after major flock tests positive for the flu

The outbreak in northern Utah is the first the state has seen this year.

(Francisco Kjolseth  |  The Salt Lake Tribune) Chickens managed by Phillip Gleason on his 2 acre lot are pictured on Saturday, Feb. 17, 2024, as he works on his multi phase plan to be self reliant at Riverbed Ranch, a remote community he founded in the western desert of Utah.

(Francisco Kjolseth | The Salt Lake Tribune) Chickens managed by Phillip Gleason on his 2 acre lot are pictured on Saturday, Feb. 17, 2024, as he works on his multi phase plan to be self reliant at Riverbed Ranch, a remote community he founded in the western desert of Utah.

https://www.sltrib.com/news/2024/10/18/bird-flu-hits-utah-requiring/

By Clarissa Casper

  | Oct. 18, 2024, 5:00 a.m.

Comment

Cache Valley • The onset of fall has brought cooler temperatures and bright colors. It has also brought birds — flocks of migrating waterfowl that chant their calls to each other in the sky each evening.

But with the birds comes disease.

Highly pathogenic avian influenza has taken over a commercial poultry flock in Cache County, according to the Utah Department of Agriculture and Food. An estimated 1.6 to 1.8 million chickens have been quarantined and are in the process of being killed, according to state veterinarian Daniel Christensen, who said this is the biggest outbreak the state has seen in recent years.

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“These poor guys,” Christensen said.

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The illness was discovered last week after the poultry farm reported an unusually high mortality rate among its flock. Upon hearing this, the state agriculture department immediately tested the birds and quarantined the facility to prevent further spread.

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Depopulation — the euthanasia of infected birds — is necessary in these cases, Christensen said, and it must happen as quickly as possible to prevent the spread of the virus while ensuring the animals don’t experience unnecessary suffering or stress.

The state did not name the facility affected by the outbreak.

The bird flu is spread by migratory waterfowl, such as ducks and geese, which are currently on their fall migration through Utah. Though the illness is often fatal to domestic poultry like chickens and turkeys, migratory birds typically carry the virus without showing severe symptoms, Christensen said.

“We were hoping we were going to make it through this year without an outbreak,” he said. “I don’t have a crystal ball, but it’s reasonable to expect that for a while, we’re going to be seeing stuff like this every fall.”

Christensen said the outbreak currently is limited to the one commercial poultry facility and does not pose an immediate public health risk. While the flu is devastating to poultry, the risk to people is low. Though a few people have reported mild symptoms in the past, like pink eye, after exposure to infected birds, Christensen said such cases are rare and not a major cause for concern.

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What Utahns should be concerned about, however, is their backyard poultry. Christensen said it is crucial for poultry owners to have biosecurity measures in place. These include limiting access to their flock, practicing strict hygiene, quarantining new or sick birds, preventing contact with wild birds and monitoring the health of flocks daily.

“We see this from time to time,” Christensen said, “where someone will have a stream going through their property, and ducks get in the stream and then mix with their chickens, and then all their chickens die.”

Signs of a flu outbreak in poultry include a sudden high death rate in flocks, nasal discharge, decreased appetite or water consumption, and lack of coordination. If your birds show any of these signs, contact the state veterinarian’s office at statevet@utah.gov.

California Reports 6 Confirmed Human Bird Flu Cases, 5 Unconfirmed

Additional cases prompt CDC to track and report confirmed cases, by state and source of exposure, in a table on its website.

October 16, 2024

The California Department of Public Health (CDPH) reported that a total of six human bird flu cases have been confirmed in California. The cases are all in Central Valley individuals who had direct contact with infected dairy cattle and were confirmed after additional testing by the U.S. Centers for Disease Control and Prevention (CDC). As CMM previously reported, the CDC confirmed the first two three human cases in the state on Oct. 3. ​ 

Two of the human cases originated from the same Central Valley farm, where both individuals had extensive exposure to infected dairy cattle. Given the amount of exposure to infected cows, evidence continues to suggest only animal-to-human spread of the virus in California, CDPH said. 

Based on CDC’s genomic sequencing of California’s first two human bird flu cases, no evidence suggests the virus has an increased ability to infect or spread between people or reduced susceptibility to antiviral medications. 

All six individuals with confirmed cases of bird flu have experienced mild symptoms, including eye redness or discharge (conjunctivitis). All have been treated according to CDC guidance and none of the individuals have been hospitalized. 

In addition to the six confirmed cases, CDPH has also been notified of five additional possible human case, also in the Central Valley. Those specimens have been sent to CDC for confirmatory testing. 

While the risk to the public remains low, additional human cases of bird flu are expected to be identified and confirmed in California among individuals who have regular contact with infected dairy cattle. CDPH continues to work closely with local health jurisdictions to identify, track, test, confirm, and treat possible and confirmed human cases of bird flu. 

On Oct. 11, the CDC reported 20 human cases of bird flu infection have been recorded in the U.S. this year; 21 in total since 2022. Ten of these cases were associated with exposure to bird flu-infected poultry and nine were associated with exposure to sick or infected dairy cows. The source of the exposure in one case, which was reported by Missouri on Sept. 6, is pending.

Going forward, CDC will track and report confirmed cases, by state and source of exposure, in a table on its website. The CDC has allocated more than 100,000 doses of seasonal flu vaccine to 12 states with dairy herds that have tested positive for bird flu. This is part of a CDC initiative announced this summer to provide a number of supplemental free seasonal flu vaccines to farm workers across states affected by bird flu to prevent the spread of seasonal flu in these communities and safeguard public health.

On the animal health side, U.S. Department of Agriculture (USDA) reported that 300 dairy cow herds in 14 U.S. states have confirmed cases of bird flu virus infections as of Oct. 9. The number of affected herds continues to grow nationally, fueled by increases in California. The USDA reported 100 affected dairy herds in California as of Oct. 11. USDA reported  that since April 2024, bird flu has been detected in 36 commercial flocks and 26 backyard flocks, for a total of 18.75 million birds affected.

As part of CDC’s Farmworker Enhanced Surveillance Program (FWESP), CDC is working with pharmacy networks eTrueNorth and Walgreens on a pilot program to provide free testing of symptomatic persons in California and one other state initially that have confirmed bird flu infections in people, poultry, or livestock.

Two California dairy workers were infected with bird flu, latest human cases in US

Image
FILE – In this photo provided by the U.S. Department of Agriculture, an animal caretaker collects a blood sample from a dairy calf vaccinated against bird flu in a containment building at the National Animal Disease Center research facility in Ames, Iowa, on Wednesday, July 31, 2024. (USDA Agricultural Research Service via AP, File)

By  JONEL ALECCIAUpdated 3:05 PM PDT, October 3, 2024Share

Two dairy workers in California were infected with bird flu, the 15th and 16th human cases detected this year in an ongoing outbreak affecting the nation’s dairy cows, health officials said Thursday.

The latest cases were found in workers who had contact with infected cattle in California’s Central Valley, where more than 50 herds have been affected since August. The workers developed eye redness known as conjunctivitis and had mild symptoms.

California health officials said the workers were employed at different farms and there is no known link between the two cases, suggesting that they were infected through animal contact, not by people.

The U.S. Centers for Disease Control and Prevention on Thursday confirmed the positive test results, the first for California. CDC officials said new cases of bird flu in people exposed to infected animals is “not unexpected.” The risk to the public remains low, they added.

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Across the U.S., more than 250 dairy herds have been infected in 14 states since the outbreak of H5N1 avian influenza was confirmed in March. Avian influenza has been spreading in wild and domestic birds in the U.S. for several years but recently was found in dairy cows.

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Before this year, one case of bird flu was detected in a person, a Colorado poultry worker who fell ill in 2022. Most cases this year have been detected in workers who had contact with cattle or poultry in Colorado, Michigan and Texas. A person in Missouri was also infected, but that person had no known contact with animals and the source of that illness has not been determined.

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

‘This is how pandemics start’: CDC shares major update on first human case of HN51 with no known animal link

Surgeon panicking in a hospital ward

The CDC has provided an update on the first human case of bird flu in the US with no known animal exposure.

 Getty Images

By Adam Chapman

Published: 19/09/2024 – 11:44

2Comments

The Missouri case has raised concerns that HN51 is spreading between humans

The Centers for Disease Control and Prevention has provided a major update on the first human case of bird flu in the US with no known animal exposure.

HN51 has spread like wildfire in dairy cows and poultry since it was first detected in April. Nearly 200 dairy herds in 14 states have tested positive for the strain.

As of August, 13 humans exposed to infected dairy cows and poultry have tested positive.
Cases have been mild – patients presented with typical flu symptoms such as fever and chills – and isolated.

However, the 14th human case confirmed earlier this month marks a major turning point in the outbreak.

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On 6 September, the Missouri Department of Health & Senior Services announced a person in the state had tested positive for the virus.

The individual tested positive after being hospitalised for other underlying health conditions and presented with chest pain, nausea, vomiting, diarrhoea and weakness. They were not severely ill and have fully recovered, according to the CDC.

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Cows

The jump from cows to humans has worried virologistsGetty Images

However, unlike previous cases, the person had not been in close contact with infected dairy cattle or farmed birds. Nor were they exposed to raw milk – another source of the infection.

More worrying still, one household contact of the patient became ill with similar symptoms on the same day as the confirmed case, was not tested, and has since recovered.

Virologists were already nervous about the spillover from cows (domesticated cattle share about 80 per cent of their genes with humans) but the first case with no known animal exposure suggests the bird flu strain has acquired the mutation needed for human-to-human transmission.

So far, there has been no evidence that HN51 has acquired this adaption, but it signals that the strain is evolving.