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 in mice, highlighting their critical protective role.

• Why it matters: Understanding how immune cells prevent respiratory virus spread is vital for developing effective vaccines and controlling outbreaks. The specific contribution of tissue-resident T cells in different respiratory compartments remains unclear.
• What they did: Using a murine model of parainfluenza virus transmission, the study examined the role of CD8 TRM in various respiratory tract regions, focusing on their activation, proliferation, and protective capacity, especially in the upper respiratory tract.
• The result: CD8 TRM in the upper respiratory tract independently provide sufficient immune surveillance to block infection propagation, informing strategies for T cell-based respiratory virus vaccines.