First Human Dies of Rare H5N5 Bird Flu Strain. Here’s What You Need to Know

Scientific AmericanMonday, November 24, 2025 at 10:10:00 PM
NegativeScience
  • A rare strain of bird flu, H5N5, has resulted in the first human death linked to this virus, which has been circulating among U.S. wildlife since late 2021. This incident marks a significant development in the ongoing concerns surrounding avian influenza, particularly as H5N1 has already caused fatalities in humans, albeit at a lower frequency.
  • The death from H5N5 raises alarms about the potential for increased transmission of bird flu to humans, highlighting the need for heightened surveillance and public health measures to prevent further cases. This incident underscores the importance of monitoring zoonotic diseases that can cross species barriers.
  • The emergence of H5N5 coincides with a troubling flu season in the U.S., where early indicators suggest a surge in H3N2 cases, known for causing severe symptoms. This dual threat of avian and seasonal influenza emphasizes the critical need for public health preparedness and response strategies to mitigate the impact of both viruses on the population.
— via World Pulse Now AI Editorial System

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