Bird Flu Returns with a Vengeance, and U.S.Surveillance Has Waned
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As birds fly south for the winter, they’re carrying with them some unwelcome cargo: the H5N1 virus, or bird flu.
In the past 30 days,the virus has struck 66 poultry flocks,leading to the deaths of more than 3.5 million turkeys, chickens and ducks, a steep increase compared to the summer months.The virus can spread easily when infected wild birds mix with commercial or backyard flocks.
at the moment, states in the middle of the country are hardest hit. But scientists expect more outbreaks in other parts of the country, given bird migratory patterns.
If not taken seriously, the fallout could lead to more than high egg prices. Influenza researchers fear a replay of last year when,for the first time,the U.S. saw close to 70 human cases, including one death.
“Absolutely we’re going to see human infections, just like we did a year ago,” says seema Lakdawala, a virologist at Emory University who studies bird flu. “Nothing has changed substantially to suggest otherwise.”
And though no human cases have been reported since early this year, scientists involved in tracking the virus say they don’t have good visibility into what’s happening in animals or humans. That’s because the federal government has scaled back on surveillance and communication.
“We’re not in a great position for monitoring things,” says Wendy Puryear,a virologist at Tufts University. “I’ve been deep in the weeds since it arrived here in the U.S., and I’m finding myself in a very uncomfortable place.”
Scaled back federal response
Puryear says a network of influenza researchers used to be in constant contact with their counterparts at federal health agencies about H5N1, mapping out research priorities and discussing changes in the virus.
But now, she says, “much of that infrastructure has been either fully closed down or substantially hampered,” under the Trump administration, due to cutbacks in staffing, early retirements and other policies.
In fact, Puryear recalls a recent meeting that consisted entirely of her colleagues announcing they’d had to halt their studies related to H5N1 in humans because of the administration’s funding cuts.
“It was a pretty depressing meeting,” she says. “Just one person after another was closing their doors.”
Another pressing issue: Data coming from the federally-run lab that dose genetic sequencing of virus collected from infected animals has slowed to a trickle, something that was true even before the government shutdown, says dr. Keith Poulsen, who runs the Wisconsin Veterinary Diagnostic Laboratory.
He says loss of staff at the U.S. Department of Agriculture – and the fact that communication with scientists needs to be “pre-approved” – has created obstacles, at a time when the threat of spillover from wildlife is increasing.
The shutdown has only exacerbated the situation.
For example, the network of veterinary labs that’s responsible for testing ceased its regular meetings because of the shutdown, Poulse
Concerns Raised Over CDC’s Downgraded Bird Flu Response
Recent concerns have been raised regarding the Centers for Disease control and Prevention’s (CDC) decision earlier this year to downgrade its emergency response level for avian influenza (bird flu).Dr.Nirav Shah, former Principal Deputy Director of the CDC and a key figure in the Biden administration’s bird flu response, has stated that while the downgrade itself wasn’t unreasonable, it shouldn’t have led to a reduction in ongoing monitoring and ground-level response efforts. https://www.npr.org/sections/goatsandsoda/2024/05/21/1208449999/bird-flu-cdc-downgrade-response
This comes as the highly pathogenic avian influenza (HPAI) continues to circulate globally, impacting both wild bird populations and commercial poultry farms. The virus, especially the H5N1 strain, has been the subject of intense scrutiny due to its potential to mutate and become more easily transmissible to humans, potentially triggering a pandemic.
Why the Downgrade Raised Concerns
Dr. Shah expressed concern that relying on the assumption that no further outbreaks will occur is a “risky game” when dealing with a virus with pandemic potential. https://www.npr.org/sections/goatsandsoda/2024/05/21/1208449999/bird-flu-cdc-downgrade-response the CDC downgraded its response level from a Level 3 to a Level 2, indicating a shift from a full-scale emergency response to a more routine surveillance posture. While the risk to the general public remains low, experts emphasize the importance of continued vigilance.
Current Bird Flu Situation (as of November 6, 2024)
As of November 6, 2024, the H5N1 virus continues to be detected in wild birds and poultry across multiple continents. Recent outbreaks have been reported in:
* United States: The USDA reports ongoing detections in commercial poultry flocks and wild birds, particularly in the Mississippi Flyway. https://www.aphis.usda.gov/aphis/newsroom/stakeholder-update/avian-influenza-outbreaks
* Europe: Several European countries have reported outbreaks in poultry, leading to culling of millions of birds. https://www.efsa.europa.eu/en/topics/animal-health/avian-influenza
* Asia: Countries like Vietnam, Indonesia, and India continue to experience outbreaks, with concerns about potential spillover to humans. https://www.who.int/emergencies/disease-outbreak-news/item/2023-DON396–avian-influenza-(h5n1)-viet-nam-viet-nam)
The World Health Association (WHO) continues to monitor the situation closely,assessing the risk of human infection and pandemic potential. https://www.who.int/news-room/fact-sheets/detail/influenza
Why Continued Monitoring is Crucial
The H5N1 virus is capable of rapid mutation. While currently not easily transmissible between humans, a mutation could change this, potentially leading to a pandemic. Continued monitoring allows scientists to:
* Track Viral Evolution: identify changes in the virus that could increase its transmissibility or virulence.
* Develop Vaccines: Prepare for potential human outbreaks by developing and stockpiling effective vaccines.
* Implement Control Measures: Quickly respond to outbreaks in poultry and wild birds to prevent further spread.
* Understand Spillover Risk: Investigate cases of human infection to understand how the virus is jumping species and identify risk factors.
Key Takeaways
* The CDC downgraded its bird flu