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Conventional imaging cannot distinguish M. abscessus infections from underlying pulmonary disease or sterile inflammation, requiring invasive procedures for definitive diagnosis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>We evaluated 11C-para-aminobenzoic acid (11C-PABA), a chemically identical radioanalog of PABA, to detect and localize infections due to M. abscessus.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>In vitro uptake assays were performed to test the metabolism and accumulation of PABA into M. abscessus reference and clinical isolates. Dynamic 11C-PABA positron emission tomography (PET) was performed in a mouse model of M. abscessus pulmonary infection and in a patient with microbiologically confirmed M. abscessus pulmonary infection (NCT 05611905).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Measurements and Main Results<\/jats:title>\n                    <jats:p>11C-PABA was intracellularly metabolized by M. abscessus to 11C-7,8-dihydropteroate. In addition, the reference strain and all 13 randomly chosen clinical isolates, including 3 resistant to trimethoprim\u2013sulfamethoxazole, rapidly accumulated PABA. No PABA accumulation was noted by heat-inactivated bacteria or mammalian cells. Dynamic 11C-PABA PET in a mouse model of M. abscessus pulmonary infection rapidly distinguished infection from sterile inflammation and also accurately monitored response to antibiotic treatment. Finally, dynamic 11C-PABA PET in a 33-year-old woman with cystic fibrosis and microbiologically confirmed M. abscessus pulmonary infection was safe and demonstrated significantly higher and sustained PET uptake in the affected lesions.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>11C-PABA PET is an innovative, clinically translatable, noninvasive, bacteria-specific diagnostic to differentiate M. abscessus infections from underlying pulmonary disease in patients. This tool could also help in monitoring treatment responses and enable precision medicine approaches for patients with complicated infections.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1164\/rccm.202409-1792oc","type":"journal-article","created":{"date-parts":[[2025,3,28]],"date-time":"2025-03-28T14:49:40Z","timestamp":1743173380000},"page":"1253-1263","update-policy":"https:\/\/doi.org\/10.1164\/crossmarkpolicies","source":"Crossref","is-referenced-by-count":4,"title":["Dynamic 11C\u2013\n                    <i>Para<\/i>\n                    \u2013Aminobenzoic Acid Positron Emission Tomography\/Computed Tomography for Visualizing Pulmonary\n                    <i>Mycobacteroides abscessus<\/i>\n                    Infections"],"prefix":"10.1093","volume":"211","author":[{"given":"Yuderleys","family":"Masias-Leon","sequence":"first","affiliation":[{"name":"Center for Infection and Inflammation Imaging Research"},{"name":"Department of Pediatrics"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carlos E.","family":"Ruiz-Gonzalez","sequence":"additional","affiliation":[{"name":"Center for Infection and Inflammation Imaging Research"},{"name":"Department of Pediatrics"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Oscar J.","family":"Nino-Meza","sequence":"additional","affiliation":[{"name":"Center for Infection and Inflammation Imaging Research"},{"name":"Department of Pediatrics"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Medha","family":"Singh","sequence":"additional","affiliation":[{"name":"Center for Infection and Inflammation Imaging Research"},{"name":"Department of Pediatrics"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mona O.","family":"Sarhan","sequence":"additional","affiliation":[{"name":"Center for Infection and Inflammation Imaging Research"},{"name":"Department of Pediatrics"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xueyi","family":"Chen","sequence":"additional","affiliation":[{"name":"Center for Infection and Inflammation Imaging Research"},{"name":"Department of Pediatrics"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kelly","family":"Flavahan","sequence":"additional","affiliation":[{"name":"Center for Infection and Inflammation Imaging Research"},{"name":"Department of Pediatrics"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Amy","family":"Kronenberg","sequence":"additional","affiliation":[{"name":"Center for Infection and Inflammation Imaging Research"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elizabeth W.","family":"Tucker","sequence":"additional","affiliation":[{"name":"Center for Infection and Inflammation Imaging Research"},{"name":"Department of Anesthesiology and Critical Care Medicine, and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joel S.","family":"Freundlich","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, Physiology, and Neuroscience, Rutgers University \u2013 New Jersey Medical School, Newark, New Jersey"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Martin A.","family":"Lodge","sequence":"additional","affiliation":[{"name":"Russell H. 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