Nikhil Prasad Fact checked by:Thailand Medical News Team Mar 14, 2026 1 hour, 26 minutes ago
Medical News: A new study has delivered promising news in the long-standing fight against seasonal influenza. Scientists have discovered that targeting two key proteins on the influenza virus at the same time can significantly reduce the virus’s ability to spread through the air, while still limiting how much it multiplies inside the body.
New research shows targeting two influenza proteins together can sharply reduce airborne transmission while still
controlling infection
The research was led by scientists from Pennsylvania State University (Penn State), United States, including experts from the Department of Immunology and Infectious Disease and the Huck Institutes of the Life Sciences. Their findings could influence how future flu vaccines are designed, potentially helping reduce not only severe illness but also transmission between people.
A Long Debate in Vaccine Design
For decades, scientists have debated whether vaccines should primarily focus on preventing the virus from replicating inside an infected person or stopping it from spreading to others. Achieving both at the same time has been considered difficult.
However, the new research suggests that this trade-off may not be necessary. By focusing immune responses on two viral proteins—hemagglutinin (HA) and neuraminidase (NA)—researchers found that it is possible to reduce viral replication and limit airborne transmission simultaneously.
This
Medical News report highlights how the discovery could shape the next generation of influenza vaccines designed not just to protect individuals, but also to slow outbreaks at the population level.
Why Scientists Used Ferrets
To investigate the idea, researchers conducted experiments using ferrets, which are widely regarded as the best animal model for studying influenza transmission. Their respiratory systems closely resemble those of humans, and they spread flu viruses through the air in similar ways.
The team studied the 2009 pandemic H1N1 influenza virus, a strain representative of seasonal influenza viruses that circulate each year. These viruses infect up to one billion people globally every year, causing between 3 to 5 million severe cases and up to 650,000 deaths, according to global health estimates.
In the experiments, infected ferrets were placed in cages that allowed air exchange with nearby uninfected ferrets. This setup allowed scientists to measure how often the virus spread through the air.
Two Viral Targets Make a Difference
The influenza virus relies heavily on two proteins on its outer surface. Hemagglutinin helps the virus attach to human cells and enter them, starting infection. Neuraminidase, on the other hand, helps newly formed virus particles escape infected cells and spread to others.
Researchers created different immune scenarios in the ferrets. Some animals developed immunity to HA alone, others to NA alone, and a third group
to both proteins simultaneously through vaccination or previous infection.
The results were striking. Animals with immunity targeting both HA and NA were far less likely to transmit the virus to nearby ferrets. Transmission dropped by roughly half compared with animals lacking combined immunity.
Interestingly, the protective effect was additive rather than synergistic, meaning each immune response contributed separately to lowering transmission risk.
A Key Threshold for Transmission
The study also uncovered a measurable threshold that could guide vaccine development. Researchers found that when virus levels in infected animals dropped below a specific level early in infection, the probability of spreading the virus fell below 50 percent.
Even a modest drop in viral levels made a major difference. For every tenfold reduction in viral load, the chance of transmission fell dramatically.
Equally important, the researchers saw no evidence that the virus quickly evolved mutations to escape immunity against the two targeted proteins. This addresses a major concern in vaccine design, as strong immune pressure can sometimes drive viral evolution.
Implications for Future Vaccines
Current flu vaccines primarily focus on stimulating immunity against hemagglutinin. While effective at reducing severe disease, they often do not fully prevent infection or onward transmission.
The new findings suggest that vaccines designed to intentionally stimulate immunity against both HA and NA could perform better at limiting the spread of influenza in communities. Such vaccines might help slow epidemics by reducing how efficiently infected individuals pass the virus to others.
Conclusion
The research provides compelling evidence that targeting two critical influenza proteins simultaneously may represent a smarter vaccine strategy. By lowering viral replication and sharply reducing airborne transmission, dual-target vaccines could help curb seasonal outbreaks more effectively. Importantly, the study also demonstrates that reducing viral levels—rather than completely eliminating infection—may still be sufficient to significantly limit transmission. If future human vaccines can replicate these results, they may transform how influenza epidemics are controlled worldwide and provide stronger community-level protection against a virus that continues to infect millions each year.
The study findings were published in the peer reviewed journal: Science Advances.
https://www.science.org/doi/10.1126/sciadv.aea8719
For the latest on influenza research, keep on logging to Thailand
Medical News.
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