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During infection or inflammation, myelopoiesis is modulated to rapidly meet the demand for more effector cells. Danger signals from peripheral tissues can influence this process. Herein we demonstrate that repetitive TLR7 stimulation via the epithelial barriers drove a potent emergency bone marrow monocyte response in mice. This process was unique to TLR7 activation and occurred independently of the canonical CCR2 and CX3CR1 axes or prototypical cytokines. The monocytes egressing the bone marrow had an immature Ly6C-high profile and differentiated into vascular Ly6C-low monocytes and tissue macrophages in multiple organs. They displayed a blunted cytokine response to further TLR7 stimulation and reduced lung viral load after RSV and influenza virus infection. These data provide insights into the emergency myelopoiesis likely to occur in response to the encounter of single-stranded RNA viruses at barrier sites.<\/jats:p>","DOI":"10.7554\/elife.85647","type":"journal-article","created":{"date-parts":[[2023,8,11]],"date-time":"2023-08-11T07:15:30Z","timestamp":1691738130000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.85647","source":"Crossref","is-referenced-by-count":20,"title":["TLR7 activation at epithelial barriers promotes emergency myelopoiesis and lung antiviral immunity"],"prefix":"10.7554","volume":"12","author":[{"given":"William D","family":"Jackson","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/041kmwe10","id-type":"ROR","asserted-by":"publisher"}],"name":"Centre for Inflammatory Disease, Department of Immunology and Inflammation, Imperial College London","place":["London, United 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