Bird Flu Concerns Rise as Virus Detected in Bats
Recent research indicates that the highly pathogenic avian influenza (H5N1) virus, commonly known as bird flu, is expanding its host range to include bats, raising concerns among scientists about potential mutations and increased risk of transmission to humans. This development, coupled with ongoing research into new vaccine strategies, highlights the evolving threat posed by H5N1.
H5N1 Exposure in Vampire Bats
A study reported on November 11 at bioRxiv.org revealed that over a dozen vampire bats in Peru have been found carrying antibodies for H5N1, indicating exposure to the virus. This finding is particularly “very worrisome,” according to Vincent Munster, a virus ecologist at the Rocky Mountain Laboratories in Hamilton, Mont., who was not involved in the study. Each new mammalian host provides the virus with opportunities to mutate and evolve, potentially increasing the risk of human-to-human transmission.
Potential for Further Bat Species to be Affected
The risk may not be limited to vampire bats. Preliminary findings from Bangladesh suggest that 16 flying foxes, a type of large fruit-eating bat, may have died from bird flu. Munster is currently investigating these deaths.
New Vaccine Development at the University of Nebraska-Lincoln
Researchers at the University of Nebraska-Lincoln (UNL) are making strides in developing a new vaccine approach to combat H5N1. Led by virologist Eric Weaver, professor of biological sciences and director of the Nebraska Center for Virology, along with postdoctoral fellows Joshua Wiggins and Adthakorn Madapong, the team’s research is forthcoming in NPJ Vaccines.
The vaccine platform is designed to protect against multiple H5N1 strains and generate immunity in both the bloodstream and the respiratory tract. Testing in mice and dairy calves demonstrated strong immune responses and complete protection against severe disease. This is particularly important as there are currently no licensed H5N1 vaccines for cattle.
USDA and NIAID Funding of Chimeric Virus Research
A study published in NPJ Vaccines details research conducted by UNL scientists—Wiggins, Madapong, and Weaver—that involved constructing hybrid influenza viruses. This research was funded by the U.S. Department of Agriculture (USDA) and the National Institute of Allergy and Infectious Diseases (NIAID). The study explicitly states that it received support through USDA grant numbers 2020-06448 and 2024-08723, and NIAID grant number 1R01AI147109.
Global Impact of H5N1
Avian influenza has significantly impacted global agricultural systems, leading to the culling of over 166 million commercial poultry birds in the United States since 2022. In 2024, the virus spread to dairy cattle—an unprecedented event—resulting in illness among approximately 70 farm workers with close contact to infected animals.
Key Takeaways
- H5N1 has been detected in vampire bats in Peru and potentially in flying foxes in Bangladesh, raising concerns about viral mutation and spread.
- Researchers at the University of Nebraska-Lincoln are developing a promising new vaccine approach that shows strong efficacy in preclinical models.
- The research into chimeric viruses was funded by the USDA and NIAID.
- H5N1 continues to disrupt agricultural systems globally, with significant impacts on poultry and dairy industries.
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