Multidrug-Resistant Tuberculosis Treatment Outcomes in Relation to Treatment and Initial Versus Acquired Second-Line Drug Resistance

Background. Resistance to second-line drugs develops during treatment of multidrug-resistant (MDR) tuberculosis, but the impact on treatment outcome has not been determined. Methods. Patients with MDR tuberculosis starting second-line drug treatment were enrolled in a prospective cohort study. Sputu...

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Veröffentlicht in:Clinical infectious diseases 2016-02, Vol.62 (4), p.418-430
Hauptverfasser: Cegielski, J. Peter, Kurbatova, Ekaterina, van der Walt, Martie, Brand, Jeannette, Ershova, Julia, Tupasi, Thelma, Caoili, Janice Campos, Dalton, Tracy, Contreras, Carmen, Yagui, Martin, Bayona, Jaime, Kvasnovsky, Charlotte, Leimane, Vaira, Kuksa, Liga, Chen, Michael P., Via, Laura E., Hwang, Soo Hee, Wolfgang, Melanie, Volchenkov, Grigory V., Somova, Tatiana, Smith, Sarah E., Akksilp, Somsak, Wattanaamornkiet, Wanpen, Kim, Hee Jin, Kim, Chang-ki, Kazennyy, Boris Y., Khorosheva, Tatiana, Kliiman, Kai, Viiklepp, Piret, Jou, Ruwen, Huang, Angela Song-En, Vasilyeva, Irina A., Demikhova, Olga V.
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container_end_page 430
container_issue 4
container_start_page 418
container_title Clinical infectious diseases
container_volume 62
creator Cegielski, J. Peter
Kurbatova, Ekaterina
van der Walt, Martie
Brand, Jeannette
Ershova, Julia
Tupasi, Thelma
Caoili, Janice Campos
Dalton, Tracy
Contreras, Carmen
Yagui, Martin
Bayona, Jaime
Kvasnovsky, Charlotte
Leimane, Vaira
Kuksa, Liga
Chen, Michael P.
Via, Laura E.
Hwang, Soo Hee
Wolfgang, Melanie
Volchenkov, Grigory V.
Somova, Tatiana
Smith, Sarah E.
Akksilp, Somsak
Wattanaamornkiet, Wanpen
Kim, Hee Jin
Kim, Chang-ki
Kazennyy, Boris Y.
Khorosheva, Tatiana
Kliiman, Kai
Viiklepp, Piret
Jou, Ruwen
Huang, Angela Song-En
Vasilyeva, Irina A.
Demikhova, Olga V.
description Background. Resistance to second-line drugs develops during treatment of multidrug-resistant (MDR) tuberculosis, but the impact on treatment outcome has not been determined. Methods. Patients with MDR tuberculosis starting second-line drug treatment were enrolled in a prospective cohort study. Sputum cultures were analyzed at a central reference laboratory. We compared subjects with successful and poor treatment outcomes in terms of (1) initial and acquired resistance to fluoroquinolones and second-line injectable drugs (SLIs) and (2) treatment regimens. Results. Of 1244 patients with MDR tuberculosis, 973 (78.2%) had known outcomes and 232 (18.6%) were lost to follow-up. Among those with known outcomes, treatment succeeded in 85.8% with plain MDR tuberculosis, 69.7% with initial resistance to either a fluoroquinolone or an SLI, 37.5% with acquired resistance to a fluoroquinolone or SLI, 29.3% with initial and 13.0% with acquired extensively drug-resistant tuberculosis (P < .001 for trend). In contrast, among those with known outcomes, treatment success increased stepwise from 41.6% to 92.3% as the number of drugs proven effective increased from ≤1 to ≥5 (P < .001 for trend), while acquired drug resistance decreased from 12% to 16% range, depending on the drug, down to 0%–2% (P < .001 for trend). In multivariable analysis, the adjusted odds of treatment success decreased 0.62-fold (95% confidence interval, .56–.69) for each increment in drug resistance and increased 2.1-fold (1.40–3.18) for each additional effective drug, controlling for differences between programs and patients. Specific treatment, patient, and program variables were also associated with treatment outcome. Conclusions. Increasing drug resistance was associated in a logical stepwise manner with poor treatment outcomes. Acquired resistance was worse than initial resistance to the same drugs. Increasing numbers of effective drugs, specific drugs, and specific program characteristics were associated with better outcomes and less acquired resistance.
doi_str_mv 10.1093/cid/civ910
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Peter ; Kurbatova, Ekaterina ; van der Walt, Martie ; Brand, Jeannette ; Ershova, Julia ; Tupasi, Thelma ; Caoili, Janice Campos ; Dalton, Tracy ; Contreras, Carmen ; Yagui, Martin ; Bayona, Jaime ; Kvasnovsky, Charlotte ; Leimane, Vaira ; Kuksa, Liga ; Chen, Michael P. ; Via, Laura E. ; Hwang, Soo Hee ; Wolfgang, Melanie ; Volchenkov, Grigory V. ; Somova, Tatiana ; Smith, Sarah E. ; Akksilp, Somsak ; Wattanaamornkiet, Wanpen ; Kim, Hee Jin ; Kim, Chang-ki ; Kazennyy, Boris Y. ; Khorosheva, Tatiana ; Kliiman, Kai ; Viiklepp, Piret ; Jou, Ruwen ; Huang, Angela Song-En ; Vasilyeva, Irina A. ; Demikhova, Olga V.</creator><creatorcontrib>Cegielski, J. Peter ; Kurbatova, Ekaterina ; van der Walt, Martie ; Brand, Jeannette ; Ershova, Julia ; Tupasi, Thelma ; Caoili, Janice Campos ; Dalton, Tracy ; Contreras, Carmen ; Yagui, Martin ; Bayona, Jaime ; Kvasnovsky, Charlotte ; Leimane, Vaira ; Kuksa, Liga ; Chen, Michael P. ; Via, Laura E. ; Hwang, Soo Hee ; Wolfgang, Melanie ; Volchenkov, Grigory V. ; Somova, Tatiana ; Smith, Sarah E. ; Akksilp, Somsak ; Wattanaamornkiet, Wanpen ; Kim, Hee Jin ; Kim, Chang-ki ; Kazennyy, Boris Y. ; Khorosheva, Tatiana ; Kliiman, Kai ; Viiklepp, Piret ; Jou, Ruwen ; Huang, Angela Song-En ; Vasilyeva, Irina A. ; Demikhova, Olga V. ; Global PETTS Investigators ; Global PETTS Investigators ; on behalf of the Global PETTS Investigators</creatorcontrib><description>Background. Resistance to second-line drugs develops during treatment of multidrug-resistant (MDR) tuberculosis, but the impact on treatment outcome has not been determined. Methods. Patients with MDR tuberculosis starting second-line drug treatment were enrolled in a prospective cohort study. Sputum cultures were analyzed at a central reference laboratory. We compared subjects with successful and poor treatment outcomes in terms of (1) initial and acquired resistance to fluoroquinolones and second-line injectable drugs (SLIs) and (2) treatment regimens. Results. Of 1244 patients with MDR tuberculosis, 973 (78.2%) had known outcomes and 232 (18.6%) were lost to follow-up. Among those with known outcomes, treatment succeeded in 85.8% with plain MDR tuberculosis, 69.7% with initial resistance to either a fluoroquinolone or an SLI, 37.5% with acquired resistance to a fluoroquinolone or SLI, 29.3% with initial and 13.0% with acquired extensively drug-resistant tuberculosis (P &lt; .001 for trend). In contrast, among those with known outcomes, treatment success increased stepwise from 41.6% to 92.3% as the number of drugs proven effective increased from ≤1 to ≥5 (P &lt; .001 for trend), while acquired drug resistance decreased from 12% to 16% range, depending on the drug, down to 0%–2% (P &lt; .001 for trend). In multivariable analysis, the adjusted odds of treatment success decreased 0.62-fold (95% confidence interval, .56–.69) for each increment in drug resistance and increased 2.1-fold (1.40–3.18) for each additional effective drug, controlling for differences between programs and patients. Specific treatment, patient, and program variables were also associated with treatment outcome. Conclusions. Increasing drug resistance was associated in a logical stepwise manner with poor treatment outcomes. Acquired resistance was worse than initial resistance to the same drugs. Increasing numbers of effective drugs, specific drugs, and specific program characteristics were associated with better outcomes and less acquired resistance.</description><identifier>ISSN: 1058-4838</identifier><identifier>EISSN: 1537-6591</identifier><identifier>DOI: 10.1093/cid/civ910</identifier><identifier>PMID: 26508515</identifier><language>eng</language><publisher>United States: Oxford University Press</publisher><subject>Adolescent ; Adult ; Aged ; and Commentaries ; Antitubercular Agents - therapeutic use ; ARTICLES AND COMMENTARIES ; Clinical outcomes ; Drug resistance ; Drug Resistance, Multiple, Bacterial ; Female ; Humans ; Male ; Medical treatment ; Middle Aged ; Multidrug resistant organisms ; Mycobacterium tuberculosis - drug effects ; Mycobacterium tuberculosis - isolation &amp; purification ; Prospective Studies ; Sputum - microbiology ; Treatment Outcome ; Tuberculosis ; Tuberculosis, Multidrug-Resistant - drug therapy ; Young Adult</subject><ispartof>Clinical infectious diseases, 2016-02, Vol.62 (4), p.418-430</ispartof><rights>Copyright © 2016 Oxford University Press on behalf of the Infectious Diseases Society of America</rights><rights>Published by Oxford University Press for the Infectious Diseases Society of America 2015. This work is written by (a) US Government employee(s) and is in the public domain in the US.</rights><rights>Copyright Oxford University Press, UK Feb 15, 2016</rights><rights>Published by Oxford University Press for the Infectious Diseases Society of America 2015. This work is written by (a) US Government employee(s) and is in the public domain in the US. 2015</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c428t-f26013b1fffc360f4cd988374014450bc81c3280f33295b37ef46b443a075d2c3</citedby><cites>FETCH-LOGICAL-c428t-f26013b1fffc360f4cd988374014450bc81c3280f33295b37ef46b443a075d2c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/26370244$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/26370244$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>230,314,777,781,800,882,27905,27906,57998,58231</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/26508515$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Cegielski, J. Peter</creatorcontrib><creatorcontrib>Kurbatova, Ekaterina</creatorcontrib><creatorcontrib>van der Walt, Martie</creatorcontrib><creatorcontrib>Brand, Jeannette</creatorcontrib><creatorcontrib>Ershova, Julia</creatorcontrib><creatorcontrib>Tupasi, Thelma</creatorcontrib><creatorcontrib>Caoili, Janice Campos</creatorcontrib><creatorcontrib>Dalton, Tracy</creatorcontrib><creatorcontrib>Contreras, Carmen</creatorcontrib><creatorcontrib>Yagui, Martin</creatorcontrib><creatorcontrib>Bayona, Jaime</creatorcontrib><creatorcontrib>Kvasnovsky, Charlotte</creatorcontrib><creatorcontrib>Leimane, Vaira</creatorcontrib><creatorcontrib>Kuksa, Liga</creatorcontrib><creatorcontrib>Chen, Michael P.</creatorcontrib><creatorcontrib>Via, Laura E.</creatorcontrib><creatorcontrib>Hwang, Soo Hee</creatorcontrib><creatorcontrib>Wolfgang, Melanie</creatorcontrib><creatorcontrib>Volchenkov, Grigory V.</creatorcontrib><creatorcontrib>Somova, Tatiana</creatorcontrib><creatorcontrib>Smith, Sarah E.</creatorcontrib><creatorcontrib>Akksilp, Somsak</creatorcontrib><creatorcontrib>Wattanaamornkiet, Wanpen</creatorcontrib><creatorcontrib>Kim, Hee Jin</creatorcontrib><creatorcontrib>Kim, Chang-ki</creatorcontrib><creatorcontrib>Kazennyy, Boris Y.</creatorcontrib><creatorcontrib>Khorosheva, Tatiana</creatorcontrib><creatorcontrib>Kliiman, Kai</creatorcontrib><creatorcontrib>Viiklepp, Piret</creatorcontrib><creatorcontrib>Jou, Ruwen</creatorcontrib><creatorcontrib>Huang, Angela Song-En</creatorcontrib><creatorcontrib>Vasilyeva, Irina A.</creatorcontrib><creatorcontrib>Demikhova, Olga V.</creatorcontrib><creatorcontrib>Global PETTS Investigators</creatorcontrib><creatorcontrib>Global PETTS Investigators</creatorcontrib><creatorcontrib>on behalf of the Global PETTS Investigators</creatorcontrib><title>Multidrug-Resistant Tuberculosis Treatment Outcomes in Relation to Treatment and Initial Versus Acquired Second-Line Drug Resistance</title><title>Clinical infectious diseases</title><addtitle>Clin Infect Dis</addtitle><description>Background. Resistance to second-line drugs develops during treatment of multidrug-resistant (MDR) tuberculosis, but the impact on treatment outcome has not been determined. Methods. Patients with MDR tuberculosis starting second-line drug treatment were enrolled in a prospective cohort study. Sputum cultures were analyzed at a central reference laboratory. We compared subjects with successful and poor treatment outcomes in terms of (1) initial and acquired resistance to fluoroquinolones and second-line injectable drugs (SLIs) and (2) treatment regimens. Results. Of 1244 patients with MDR tuberculosis, 973 (78.2%) had known outcomes and 232 (18.6%) were lost to follow-up. Among those with known outcomes, treatment succeeded in 85.8% with plain MDR tuberculosis, 69.7% with initial resistance to either a fluoroquinolone or an SLI, 37.5% with acquired resistance to a fluoroquinolone or SLI, 29.3% with initial and 13.0% with acquired extensively drug-resistant tuberculosis (P &lt; .001 for trend). In contrast, among those with known outcomes, treatment success increased stepwise from 41.6% to 92.3% as the number of drugs proven effective increased from ≤1 to ≥5 (P &lt; .001 for trend), while acquired drug resistance decreased from 12% to 16% range, depending on the drug, down to 0%–2% (P &lt; .001 for trend). In multivariable analysis, the adjusted odds of treatment success decreased 0.62-fold (95% confidence interval, .56–.69) for each increment in drug resistance and increased 2.1-fold (1.40–3.18) for each additional effective drug, controlling for differences between programs and patients. Specific treatment, patient, and program variables were also associated with treatment outcome. Conclusions. Increasing drug resistance was associated in a logical stepwise manner with poor treatment outcomes. Acquired resistance was worse than initial resistance to the same drugs. Increasing numbers of effective drugs, specific drugs, and specific program characteristics were associated with better outcomes and less acquired resistance.</description><subject>Adolescent</subject><subject>Adult</subject><subject>Aged</subject><subject>and Commentaries</subject><subject>Antitubercular Agents - therapeutic use</subject><subject>ARTICLES AND COMMENTARIES</subject><subject>Clinical outcomes</subject><subject>Drug resistance</subject><subject>Drug Resistance, Multiple, Bacterial</subject><subject>Female</subject><subject>Humans</subject><subject>Male</subject><subject>Medical treatment</subject><subject>Middle Aged</subject><subject>Multidrug resistant organisms</subject><subject>Mycobacterium tuberculosis - drug effects</subject><subject>Mycobacterium tuberculosis - isolation &amp; purification</subject><subject>Prospective Studies</subject><subject>Sputum - microbiology</subject><subject>Treatment Outcome</subject><subject>Tuberculosis</subject><subject>Tuberculosis, Multidrug-Resistant - drug therapy</subject><subject>Young Adult</subject><issn>1058-4838</issn><issn>1537-6591</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpdkc1rFTEUxYMotlY37pWAGylMvZkkk8ymUKrVwpNCfboNmUym5jGTtPkouPcPN-W15dlFSLj3x7nn5iD0lsARgZ5-Mm6s57Yn8AztE05F0_GePK9v4LJhkso99CqlDQAhEvhLtNd2HCQnfB_9_V7m7MZYrppLm1zK2me8LoONpsyhFvA6Wp0XW8sXJZuw2ISdx5d21tkFj3PYIbQf8bl32ekZ_7IxlYRPzE1x0Y74hzXBj83KeYs_13n4YZ6xr9GLSc_Jvrm_D9DPsy_r02_N6uLr-enJqjGslbmZ2g4IHcg0TYZ2MDEz9lJSwYAwxmEwkhjaSpgobXs-UGEn1g2MUQ2Cj62hB-h4q3tdhsWOplqOelbX0S06_lFBO_V_x7vf6ircKiZaTiWpAh_vBWK4KTZltbhk7Dxrb0NJiogOeiBCdhX98ATdhBJ9Xe-OYgKElLxSh1vKxJBStNOjGQLqLlxVw1XbcCv8ftf-I_qQZgXebYFNyiHu9KmAtv7DPwP7rJQ</recordid><startdate>20160215</startdate><enddate>20160215</enddate><creator>Cegielski, J. 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Peter ; Kurbatova, Ekaterina ; van der Walt, Martie ; Brand, Jeannette ; Ershova, Julia ; Tupasi, Thelma ; Caoili, Janice Campos ; Dalton, Tracy ; Contreras, Carmen ; Yagui, Martin ; Bayona, Jaime ; Kvasnovsky, Charlotte ; Leimane, Vaira ; Kuksa, Liga ; Chen, Michael P. ; Via, Laura E. ; Hwang, Soo Hee ; Wolfgang, Melanie ; Volchenkov, Grigory V. ; Somova, Tatiana ; Smith, Sarah E. ; Akksilp, Somsak ; Wattanaamornkiet, Wanpen ; Kim, Hee Jin ; Kim, Chang-ki ; Kazennyy, Boris Y. ; Khorosheva, Tatiana ; Kliiman, Kai ; Viiklepp, Piret ; Jou, Ruwen ; Huang, Angela Song-En ; Vasilyeva, Irina A. ; Demikhova, Olga V.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c428t-f26013b1fffc360f4cd988374014450bc81c3280f33295b37ef46b443a075d2c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Adolescent</topic><topic>Adult</topic><topic>Aged</topic><topic>and Commentaries</topic><topic>Antitubercular Agents - therapeutic use</topic><topic>ARTICLES AND COMMENTARIES</topic><topic>Clinical outcomes</topic><topic>Drug resistance</topic><topic>Drug Resistance, Multiple, Bacterial</topic><topic>Female</topic><topic>Humans</topic><topic>Male</topic><topic>Medical treatment</topic><topic>Middle Aged</topic><topic>Multidrug resistant organisms</topic><topic>Mycobacterium tuberculosis - drug effects</topic><topic>Mycobacterium tuberculosis - isolation &amp; purification</topic><topic>Prospective Studies</topic><topic>Sputum - microbiology</topic><topic>Treatment Outcome</topic><topic>Tuberculosis</topic><topic>Tuberculosis, Multidrug-Resistant - drug therapy</topic><topic>Young Adult</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Cegielski, J. 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Peter</au><au>Kurbatova, Ekaterina</au><au>van der Walt, Martie</au><au>Brand, Jeannette</au><au>Ershova, Julia</au><au>Tupasi, Thelma</au><au>Caoili, Janice Campos</au><au>Dalton, Tracy</au><au>Contreras, Carmen</au><au>Yagui, Martin</au><au>Bayona, Jaime</au><au>Kvasnovsky, Charlotte</au><au>Leimane, Vaira</au><au>Kuksa, Liga</au><au>Chen, Michael P.</au><au>Via, Laura E.</au><au>Hwang, Soo Hee</au><au>Wolfgang, Melanie</au><au>Volchenkov, Grigory V.</au><au>Somova, Tatiana</au><au>Smith, Sarah E.</au><au>Akksilp, Somsak</au><au>Wattanaamornkiet, Wanpen</au><au>Kim, Hee Jin</au><au>Kim, Chang-ki</au><au>Kazennyy, Boris Y.</au><au>Khorosheva, Tatiana</au><au>Kliiman, Kai</au><au>Viiklepp, Piret</au><au>Jou, Ruwen</au><au>Huang, Angela Song-En</au><au>Vasilyeva, Irina A.</au><au>Demikhova, Olga V.</au><aucorp>Global PETTS Investigators</aucorp><aucorp>Global PETTS Investigators</aucorp><aucorp>on behalf of the Global PETTS Investigators</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Multidrug-Resistant Tuberculosis Treatment Outcomes in Relation to Treatment and Initial Versus Acquired Second-Line Drug Resistance</atitle><jtitle>Clinical infectious diseases</jtitle><addtitle>Clin Infect Dis</addtitle><date>2016-02-15</date><risdate>2016</risdate><volume>62</volume><issue>4</issue><spage>418</spage><epage>430</epage><pages>418-430</pages><issn>1058-4838</issn><eissn>1537-6591</eissn><abstract>Background. Resistance to second-line drugs develops during treatment of multidrug-resistant (MDR) tuberculosis, but the impact on treatment outcome has not been determined. Methods. Patients with MDR tuberculosis starting second-line drug treatment were enrolled in a prospective cohort study. Sputum cultures were analyzed at a central reference laboratory. We compared subjects with successful and poor treatment outcomes in terms of (1) initial and acquired resistance to fluoroquinolones and second-line injectable drugs (SLIs) and (2) treatment regimens. Results. Of 1244 patients with MDR tuberculosis, 973 (78.2%) had known outcomes and 232 (18.6%) were lost to follow-up. Among those with known outcomes, treatment succeeded in 85.8% with plain MDR tuberculosis, 69.7% with initial resistance to either a fluoroquinolone or an SLI, 37.5% with acquired resistance to a fluoroquinolone or SLI, 29.3% with initial and 13.0% with acquired extensively drug-resistant tuberculosis (P &lt; .001 for trend). In contrast, among those with known outcomes, treatment success increased stepwise from 41.6% to 92.3% as the number of drugs proven effective increased from ≤1 to ≥5 (P &lt; .001 for trend), while acquired drug resistance decreased from 12% to 16% range, depending on the drug, down to 0%–2% (P &lt; .001 for trend). In multivariable analysis, the adjusted odds of treatment success decreased 0.62-fold (95% confidence interval, .56–.69) for each increment in drug resistance and increased 2.1-fold (1.40–3.18) for each additional effective drug, controlling for differences between programs and patients. Specific treatment, patient, and program variables were also associated with treatment outcome. Conclusions. Increasing drug resistance was associated in a logical stepwise manner with poor treatment outcomes. Acquired resistance was worse than initial resistance to the same drugs. Increasing numbers of effective drugs, specific drugs, and specific program characteristics were associated with better outcomes and less acquired resistance.</abstract><cop>United States</cop><pub>Oxford University Press</pub><pmid>26508515</pmid><doi>10.1093/cid/civ910</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record>
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identifier ISSN: 1058-4838
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Jstor Complete Legacy; Oxford University Press Journals All Titles (1996-Current); Alma/SFX Local Collection
subjects Adolescent
Adult
Aged
and Commentaries
Antitubercular Agents - therapeutic use
ARTICLES AND COMMENTARIES
Clinical outcomes
Drug resistance
Drug Resistance, Multiple, Bacterial
Female
Humans
Male
Medical treatment
Middle Aged
Multidrug resistant organisms
Mycobacterium tuberculosis - drug effects
Mycobacterium tuberculosis - isolation & purification
Prospective Studies
Sputum - microbiology
Treatment Outcome
Tuberculosis
Tuberculosis, Multidrug-Resistant - drug therapy
Young Adult
title Multidrug-Resistant Tuberculosis Treatment Outcomes in Relation to Treatment and Initial Versus Acquired Second-Line Drug Resistance
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