Nasal Immune Cells Slow Influenza Virus: New Study Findings
- Research from the University of Gothenburg has identified a specific group of memory cells in the nose that can slow the influenza virus immediately upon its entry into...
- The findings, published on April 7, 2026, by the Sahlgrenska Academy, suggest that these cells reduce viral replication in the nose.
- The study focused on CD4 tissue-resident memory T cells (TRM), which are adaptive immune components.
Research from the University of Gothenburg has identified a specific group of memory cells in the nose that can slow the influenza virus immediately upon its entry into the body. These cells, identified as CD4 memory T cells, remain in the nasal tissue following an influenza infection and can rapidly reactivate when the virus returns.
The findings, published on April 7, 2026, by the Sahlgrenska Academy, suggest that these cells reduce viral replication in the nose. By limiting the virus at the initial point of entry, these cells may help protect the body against more severe illness.
The Role of CD4 Memory T Cells
The study focused on CD4 tissue-resident memory T cells (TRM), which are adaptive immune components. According to the research, these cells stay within the nasal mucosa after an initial infection, acting as a first line of defense.
When the body encounters the influenza virus again, these resident memory cells reactivate quickly. This process allows the immune system to respond directly at the site of infection rather than relying solely on a systemic response from the blood.
Nimitha R. Mathew, researcher at the Sahlgrenska Academy, University of Gothenburg
We show that CD4 memory T cells can remain in nasal tissue after an influenza infection and rapidly reactivate when the virus returns. This means the immune system can respond directly at the site where the virus first enters the body,
To verify these effects, researchers conducted studies in mice. The results demonstrated that these immune cells helped limit viral levels and reduced tissue damage in the nose during subsequent infections.
The research team also analyzed cells from the nasal mucosa of healthy adults to determine if similar cells are present in humans.
Implications for Vaccine Development
The discovery of these localized memory cells provides a scientific basis for improving how influenza is prevented. Current influenza vaccines are typically administered as injections in the arm, which primarily stimulate immune responses within the blood.
Because the virus first encounters the immune system in the nasal passages, researchers are working to develop influenza vaccines that can be administered through the nose. The goal of nasal vaccines is to strengthen the body’s defenses specifically where the virus first enters.
By informing the development of these nasal vaccines, the study from the University of Gothenburg aims to create a more effective way to reduce viral replication and protect against severe illness by mimicking the natural residency of CD4 memory T cells in the nasal tissue.