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Furthermore, clinical studies alone often provide correlative insights rather than causal mechanisms. Thus, it is essential to compare clinical samples with relevant animal models and conduct functional experiments to understand the etiology of PASC. In this study, we comprehensively compared bronchoalveolar lavage fluid single-cell RNA sequencing data derived from clinical PASC samples and a mouse model of PASC. This revealed a pro-fibrotic monocyte-derived macrophage response in respiratory PASC, as well as abnormal interactions between pulmonary macrophages and respiratory resident T cells, in both humans and mice. Interferon-\u03b3 (IFN-\u03b3) emerged as a key node mediating the immune anomalies in respiratory PASC. Neutralizing IFN-\u03b3 after the resolution of acute SARS-CoV-2 infection reduced lung inflammation and tissue fibrosis in mice. Together, our study underscores the importance of performing comparative analysis to understand the cause of PASC and suggests that the IFN-\u03b3 signaling axis might represent a therapeutic target.<\/jats:p>","DOI":"10.1126\/scitranslmed.adn0136","type":"journal-article","created":{"date-parts":[[2024,7,17]],"date-time":"2024-07-17T14:00:49Z","timestamp":1721224849000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":52,"title":["Comparative single-cell analysis reveals IFN-\u03b3 as a driver of respiratory sequelae after acute COVID-19"],"prefix":"10.1126","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5426-1498","authenticated-orcid":true,"given":"Chaofan","family":"Li","sequence":"first","affiliation":[{"name":"Beirne B. 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