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American Focus > Blog > Health and Wellness > Immunity to seasonal flu protects against severe illness from bird flu in ferrets, research reveals
Health and Wellness

Immunity to seasonal flu protects against severe illness from bird flu in ferrets, research reveals

Last updated: July 23, 2025 11:12 am
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Immunity to seasonal flu protects against severe illness from bird flu in ferrets, research reveals
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In a recent study conducted by scientists at Penn State and the University of Pittsburgh, it was discovered that immunity to the 2009 pandemic H1N1 virus provides protection against severe illness from the H5N1 highly pathogenic avian influenza virus. The research, published in the journal Science Translational Medicine, sheds light on why the current H5N1 bird flu outbreak is causing mostly mild symptoms in humans despite its historically high fatality rate.

Lead author Troy Sutton, associate professor of veterinary and biomedical sciences at Penn State, explained that the widespread exposure to the H1N1 virus during the 2009 pandemic has now provided immunity to a large portion of the population. This cross-immunity seems to be protective against the more recent H5N1 strain, resulting in fewer cases and less severe disease.

The H5N1 viruses responsible for the current outbreak emerged in 2020 and have since spread globally, infecting various animal species. In the United States, 70 human cases of H5N1 have been confirmed, with most individuals experiencing mild symptoms such as conjunctivitis, fever, and cough.

The study was conducted using ferrets as an animal model for influenza virus infections. The researchers exposed the ferrets to different seasonal influenza viruses to determine their level of immunity. Ferrets with pre-existing immunity to the 2009 H1N1 virus showed a significant reduction in severe illness when exposed to H5N1, while those without immunity or with immunity to other seasonal flu strains experienced more severe symptoms.

The findings suggest that pre-existing immunity to the 2009 H1N1 virus or other seasonal flu strains can reduce the severity of H5N1 disease. This may explain why the current H5N1 outbreak is causing milder symptoms in humans compared to previous outbreaks.

See also  Frequent emergency care during pregnancy could signal greater risk for severe maternal morbidity

It is important to note that while the existing immunity seems to offer protection against H5N1, the virus still has the potential to evolve and become more dangerous. Continued surveillance and research are essential to monitor the evolution of the virus and develop strategies to combat future outbreaks.

The research was conducted in a biosafety level 3 laboratory at Penn State, ensuring compliance with all safety regulations. The study provides valuable insights into the interactions between different influenza viruses and highlights the importance of understanding immunity in the context of emerging infectious diseases.

TAGGED:BirdferretsFluillnessImmunityprotectsResearchRevealsseasonalsevere
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