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Previous studies have shown that targeted stimulation of lung innate immune defenses through intranasal administration of the Toll-like receptor 5 agonist flagellin improves the treatment of pneumonia when combined with antibiotics. To promote translation to the clinic application, this study assessed the direct delivery of flagellin to the airways through nebulization using a vibrating mesh nebulizer in mice. Intranasal delivery achieved approximately 40% lung deposition of the administered flagellin dose, whereas nebulization yielded less than 1%. Despite these differences, nebulized flagellin induced transient activation of lung innate immunity characterized by cytokine\/chemokine production and neutrophil infiltration into airways analogous to intranasal administration. Furthermore, inhalation by nebulization resulted in an accelerated resolution of systemic pro-inflammatory responses. Lastly, adjunct therapy combining nebulized flagellin and amoxicillin proved effective against antibiotic-resistant pneumococcal pneumonia in mice. We posit that flagellin aerosol therapy represents a safe and promising approach to address bacterial pneumonia within the context of antimicrobial resistance.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1128\/aac.00866-24","type":"journal-article","created":{"date-parts":[[2024,10,31]],"date-time":"2024-10-31T09:00:28Z","timestamp":1730365228000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":10,"title":["Targeted delivery of flagellin by nebulization offers optimized respiratory immunity and defense against pneumococcal pneumonia"],"prefix":"10.1128","volume":"68","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6005-1078","authenticated-orcid":false,"given":"Mara","family":"Baldry","sequence":"first","affiliation":[{"name":"Univ. 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