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American Focus > Blog > Health and Wellness > H5N1 bird flu hasn’t been as deadly as feared. Study offers theory why
Health and Wellness

H5N1 bird flu hasn’t been as deadly as feared. Study offers theory why

Last updated: July 23, 2025 12:55 pm
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H5N1 bird flu hasn’t been as deadly as feared. Study offers theory why
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The H5N1 bird flu virus has a long history of causing severe illness in humans, with a high mortality rate. However, a recent trend in the United States has experts puzzled – out of 70 reported cases in the past 18 months, only one death occurred. A new study published in Science Translational Medicine suggests that immunity developed from the 2009 H1N1 flu pandemic may be providing some cross-protection against H5N1, potentially reducing the severity of illness.

The study, conducted in ferrets, showed that animals previously infected with H1N1 or H3N2 influenza viruses had some level of protection against H5N1 infection. This finding has raised hopes that if H5N1 were to become easily transmissible among humans, the resulting pandemic may not be as devastating as initially feared.

While traditional influenza research in ferrets focused on naive animals, recent studies have shifted towards using animals with prior flu infections to better mimic human immune responses. The study analyzed blood samples from ferrets infected with different flu viruses to determine the level of cross-reactivity against H5N1.

One theory behind this cross-protection is the similarity between the neuraminidase protein of H1N1 and H5N1 viruses. Previous research in Hong Kong also found high levels of cross-reacting antibodies against H5N1 in individuals previously infected with the 2009 H1N1 virus.

However, not all experts are convinced that H1N1 immunity can fully explain the milder cases of H5N1 in the U.S. Other factors such as viral differences, modes of transmission, and host characteristics may also play a role. It is essential to continue research to better understand the mechanisms of protection against H5N1.

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While the study sheds light on the potential role of H1N1 immunity in mitigating H5N1 infections, experts caution against complacency. The ever-evolving nature of flu viruses means that the current findings may not hold true for future strains. Vigilance and ongoing research are crucial in preparing for potential future pandemics.

TAGGED:BirddeadlyfearedFluH5N1HasntoffersStudyTheory
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