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SFTS is particularly associated with a high risk of mortality in immunocompromised individuals, while most patients who die of SFTS exhibit symptoms of severe encephalitis before death. However, the region of brain damage and mechanisms by which the SFTS virus (SFTSV) causes encephalitis remains unknown. Here, we revealed that SFTSV infects the brainstem and spinal cord, which are regions of the brain associated with respiratory function, and motor nerves in IFNAR1<jats:sup>\u2010\/\u2010<\/jats:sup> mice. Further, we show that A1\u2010reactive astrocytes are activated, causing nerve cell death, in infected mice. Primary astrocytes of SFTSV\u2010infected IFNAR1<jats:sup>\u2010\/\u2010<\/jats:sup> mice also induced neuronal cell death through the activation of A1\u2010reactive astrocytes. Herein, we showed that SFTSV induces fatal neuroinflammation in the brain regions important for respiratory function and motor nerve, which may underlie mortality in SFTS patients. This study provides new insights for the treatment of SFTS, for which there is currently no therapeutic approach.<\/jats:p>","DOI":"10.1002\/jmv.29854","type":"journal-article","created":{"date-parts":[[2024,8,13]],"date-time":"2024-08-13T07:08:48Z","timestamp":1723532928000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Activation of neurotoxic A1\u2010reactive astrocytes by SFTS virus infection accelerates fatal brain damage in IFNAR1<sup>\u2010\/\u2010<\/sup> mice"],"prefix":"10.1002","volume":"96","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1099-1728","authenticated-orcid":false,"given":"Seon\u2010Hee","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Pharmacology, Institute of Medical Sciences, College of Medicine Gyeongsang National University Jinju Republic of 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