Nasal Memory Cells Slow Influenza Virus

Researchers at the University of Gothenburg, including Nimitha R. Mathew and Davide Angeletti from the Sahlgrenska University Hospital, have identified a group of CD4 memory T cells in nasal tissue that can rapidly reactivate to slow the influenza virus upon entry. This discovery, published in the Journal of Experimental Medicine, suggests that these cells reduce viral replication and protect against severe illness. The findings are crucial for guiding the development of new nasal influenza vaccines, which aim to strengthen the body's defenses at the initial site of infection, unlike current injectable vaccines that primarily stimulate systemic immune responses.