The past year has been a tumultuous period for the dairy industry, grappling with the onset of the H5N1 bird flu virus in dairy cattle. Dairy farmers have significantly strengthened biosecurity measures, and researchers have gained valuable insights into the virus. This ongoing battle was highlighted in a recent “Dairy Defined” podcast, where top experts from the National Milk Producers Federation (NMPF) shared their perspectives.
Understanding H5N1’s Impact on Dairy Cattle
The introduction of the H5N1 Avian Influenza virus to dairy herds in March 2024 caught the industry by surprise. Since then, more than 1,000 dairy herds have been affected. Thankfully, effective eradication efforts in certain areas raise hopes of completely eliminating the virus from the U.S. dairy cattle population. Jamie Jonker, NMPF’s chief science officer, remains optimistic about this possibility, emphasizing that the timeline is uncertain but achievable.
“I do believe we’re going to eliminate the virus from the U.S. dairy cattle population. I think it’s just a matter of when, not if,” he said.
The Role of Biosecurity in Containment and Elimination
Meggan Hain, NMPF’s chief veterinary officer, underscores the crucial role of biosecurity practices in preventing and containing the virus. The National Dairy FARM (Farmers Assuring Responsible Management) Program plays a vital role in providing educational resources on biosecurity to farmers. This program helps farms develop robust biosecurity protocols to keep their operations safe.
H5N1 has offered a learning opportunity, enabling the dairy industry to identify areas for improvement. The increased vigilance in biosecurity measures and the collaborative efforts among farmers show resilience and adaptability. Hain says these lessons will better prepare the industry for future challenges.
“By setting that initial groundwork and getting the industry used to it, when we come up with something like avian influenza or bird flu, the advantage is that we can easily add onto what we’ve built already,” she says, noting that the enhanced biosecurity measures are built on top of the everyday biosecurity measures farms put in place.
The FARM Program has been instrumental in guiding the industry through the H5N1 outbreak, with a well-established framework for animal care and biosecurity. As Hain highlights, the program covers about 99% of the U.S. farm supply, offering everyday biosecurity tools that facilitate swift adaptations during outbreaks like avian influenza.
Progress and Future Challenges
USDA’s national milk testing strategy, now mandatory in 48 continental states, and the development of 12 vaccine candidates highlight the concerted efforts to address the H5N1 challenge. Six states, including Colorado, Oklahoma and Wyoming have successfully demonstrated virus-free dairy cattle populations, exemplifying effective containment strategies.
However, as Jonker points out, recent spillover events in Arizona and Nevada with a different H5N1 genotype pose new challenges.
“We’re still trying to understand: Are these just two additional kind of unique events or do we now have some sort of increased risk of spillover events in the wintertime and particularly in the Western High Desert areas, which is where all three of the spillover events have occurred,” he says. “We don’t have enough information yet there. So, I think yes, we can get rid of the virus, but we have complexities because we may have additional risk of spillover events that we might not have considered just a year ago.”
Sustaining Efforts into Year Two
As the dairy industry moves into the second year of combating H5N1, maintaining momentum and commitment to biosecurity remains crucial. While some regions remain unaffected, ongoing education and preparedness are essential in safeguarding against future outbreaks.
The challenge of H5N1 in dairy cattle presents an ongoing test of resilience for the industry. Collaborative efforts, continual learning and proactive biosecurity measures stand as pillars in overcoming this adversity and ensuring a sustainable dairy industry for the future. To listen to the entire conversation between Jonker and Hain, visit: NMPF’s Jonker, Hain See Bird Flu Lessons One Year Later - NMPF
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