Upper respiratory tract CD8+ tissue-resident memory T cells protect against viral transmission.

Upper respiratory tract CD8+ tissue-resident memory T cells alone can prevent viral transmission, with URT TRM activation sufficient for protection in mice.

• Why it matters: Understanding how immune cells prevent respiratory virus spread is crucial for developing effective vaccines and controlling outbreaks, especially as current strategies often focus on antibodies.
• What they did: The study used a murine model to examine the role of CD8 TRM in different respiratory compartments, demonstrating that URT TRM activate and proliferate upon viral exposure and can independently block transmission.
• The result: Findings reveal that URT CD8 TRM provide enough immune surveillance to stop infection spread, guiding future T cell-based vaccine designs targeting the upper respiratory tract.