Core Viewpoint - The research reveals the pathogenic role of dysplastic KRT5+ basal-like cells in alveolar regeneration, acting as a niche for tissue-resident lymphocytes that specifically inhibit alveolar regeneration after viral infection. It also suggests a potential therapeutic strategy for improving alveolar regeneration post-viral pneumonia [3][8]. Group 1: Research Findings - The study identifies that dysplastic KRT5+ basal-like cells promote the recruitment and retention of CD4+ effector T cells and CD8+ T cells in the lungs after severe viral infection [5]. - Persistent CD4+ effector T cells and CD8+ T cells secrete interferon-gamma (IFNγ), which inhibits Club cell-mediated alveolar regeneration, thereby obstructing lung function repair [5][6]. - Neutralizing IFNγ treatment can improve alveolar regeneration and lung function [6]. Group 2: Mechanisms and Implications - The research deepens the understanding of the mechanisms behind impaired lung repair and regeneration following severe viral infections [3][8]. - Blocking CXCR3 or integrin α4β7 promotes alveolar regeneration, indicating potential intervention points for therapeutic strategies [6].