{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,31]],"date-time":"2026-10-31T01:28:43Z","timestamp":1793410123839,"version":"4.5.0"},"reference-count":32,"publisher":"Oxford University Press (OUP)","issue":"7","license":[{"start":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T00:00:00Z","timestamp":1777420800000},"content-version":"vor","delay-in-days":1,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000060","name":"National Institute of Allergy and Infectious Diseases","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000060","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R01AI138646"],"award-info":[{"award-number":["R01AI138646"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["K24AI114444"],"award-info":[{"award-number":["K24AI114444"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["K24AI165099"],"award-info":[{"award-number":["K24AI165099"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["K24AI155045"],"award-info":[{"award-number":["K24AI155045"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["K23AI166093"],"award-info":[{"award-number":["K23AI166093"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Emory\/Georgia Tuberculosis Research Advancement Center","award":["P30AI168386"],"award-info":[{"award-number":["P30AI168386"]}]},{"name":"Emory University Center for AIDS Research","award":["P30AI050409"],"award-info":[{"award-number":["P30AI050409"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,7,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Rationale<\/jats:title>\n                    <jats:p>Transmission is the primary driver of tuberculosis (TB) and drug-resistant TB (DR-TB) in high-burden countries; however, where and between whom spread occurs is poorly understood.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>We conducted universal whole genome sequencing (WGS) to evaluate the role of casual contact in Mycobacterium tuberculosis transmission.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>We recruited persons diagnosed with second-line DR-TB (eg, extensively drug-resistant [XDR], pre-XDR-TB) from June 2018 to December 2022 in metropolitan Durban, South Africa. We collected named contacts and GPS coordinates of homes, clinics, and community locations visited regularly before diagnosis. Among participants genotypically clustered by whole genome sequencing (\u226412 single-nucleotide polymorphisms), we quantified the proportion attributable to close versus casual contact. Close contact was defined as person-to-person links or overlapping hospitalizations. Casual contact links were based on geographic proximity of homes and community locations, or shared outpatient clinics.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Measurements and Main Results<\/jats:title>\n                    <jats:p>We enrolled 305 of 383 (80%) persons diagnosed with second-line DR-TB. TB isolates were sequenced for 251 (83%) participants; 141 (56%) were genotypically linked, forming 25 clusters (range, 2-49 persons\/cluster). Among clustered participants, 69 (49%) were epidemiologically linked by casual contact and 13 (9%) through close contact. Multivariable analysis identified living within 1\u2009km (OR, 17.9), visiting proximate community locations (OR, 1.88), shared outpatient clinic (OR, 1.72), and person-to-person links (OR, 5.38) as significant risk factors associated with genotypic clustering.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Casual contact in community locations accounted for half of transmission among genotypic clusters in a high-burden setting. Efforts to curb TB will require a greater emphasis on community-based measures to identify cases from casual contact or undetected intermediate cases, in addition to the current mainstay of contact tracing.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/ajrccm\/aamag140","type":"journal-article","created":{"date-parts":[[2026,4,24]],"date-time":"2026-04-24T11:43:42Z","timestamp":1777031022000},"page":"1585-1595","source":"Crossref","is-referenced-by-count":4,"title":["Role of casual contact in drug-resistant tuberculosis transmission: a molecular epidemiology study"],"prefix":"10.1093","volume":"212","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1665-299X","authenticated-orcid":false,"given":"Neel R","family":"Gandhi","sequence":"first","affiliation":[{"name":"Department of Epidemiology, Rollins School of Public Health, Emory University , Atlanta, GA,","place":["United States"]},{"name":"Department of Medicine, School of Medicine, Emory University , Atlanta, 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V","family":"Omar","sequence":"additional","affiliation":[{"name":"Centre for Tuberculosis, National and WHO Supranational TB Reference Laboratory, National Institute for Communicable Diseases, National Health Laboratory Service , Johannesburg,","place":["South Africa"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hikari","family":"Yoshii","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, School of Medicine, Emory University , Atlanta, GA,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fay","family":"Willis","sequence":"additional","affiliation":[{"name":"Department of Epidemiology, Rollins School of Public Health, Emory University , Atlanta, GA,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Resha","family":"Boodhram","sequence":"additional","affiliation":[{"name":"CAPRISA-MRC HIV\/TB Pathogenesis and Treatment Research Unit, Centre for the AIDS Programme 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Nichole","family":"Evans","sequence":"additional","affiliation":[{"name":"Department of Epidemiology, Rollins School of Public Health, Emory University , Atlanta, GA,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0144-0019","authenticated-orcid":false,"given":"Linrui","family":"Tang","sequence":"additional","affiliation":[{"name":"Department of Epidemiology, Mailman School of Public Health, Columbia University , New York, NY,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Melanie H","family":"Chitwood","sequence":"additional","affiliation":[{"name":"Department of Epidemiology of Microbial Diseases, Yale School of Public Health , New Haven, CT,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Senzo R","family":"Hlathi","sequence":"additional","affiliation":[{"name":"CAPRISA-MRC HIV\/TB Pathogenesis and Treatment Research Unit, Centre for the AIDS Programme of Research in South Africa (CAPRISA) , Durban,","place":["South Africa"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patience N","family":"Mbatha","sequence":"additional","affiliation":[{"name":"CAPRISA-MRC HIV\/TB Pathogenesis and Treatment Research Unit, Centre for the AIDS Programme of Research in South Africa (CAPRISA) , Durban,","place":["South Africa"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lavania","family":"Joseph","sequence":"additional","affiliation":[{"name":"Centre for Tuberculosis, National and WHO Supranational TB Reference Laboratory, National Institute for Communicable Diseases, National Health Laboratory Service , Johannesburg,","place":["South Africa"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hermina","family":"Van Der Meulen","sequence":"additional","affiliation":[{"name":"Centre for Tuberculosis, National and WHO Supranational TB Reference Laboratory, National 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N","family":"Lurie","sequence":"additional","affiliation":[{"name":"Department of Epidemiology, School of Public Health, Brown University , Providence, RI,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Barry N","family":"Kreiswirth","sequence":"additional","affiliation":[{"name":"Center for Discovery and Innovation, Hackensack Meridien Health , Nutley, NJ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joshua L","family":"Warren","sequence":"additional","affiliation":[{"name":"Department of Biostatistics, Yale School of Public Health , New Haven, CT,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristin N","family":"Nelson","sequence":"additional","affiliation":[{"name":"Department of Epidemiology, Rollins School of Public Health, Emory University , Atlanta, GA,","place":["United 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