Extensively drug resistant tuberculosis xdrtb is a form of tuberculosis caused by bacteria that are resistant to some of the most effective antitb drugs. Mdrtb in addition to resistance to any fluroquinolones and at least one of three injectable secondline drugs, namely amikacin. Quarantine and isolation showing 14 of 6 pages in this report. We aimed to determine factors associated with default in multi and extensively drugresistant. Preextensively drug resistant tuberculosis prexdrtb. Portugal is a low incidence country for tuberculosis tb disease. Delamanid, a nitroimidazole, is a new tuberculosis tb drug developed to address some of the adverse reactions and related adherence difficulties associated with currently available mediations for treating drug resistant tb. Multiclonal evolution of multidrugresistantextensively. Some forms of tb are also resistant to secondline medications, and are called extensively drug resistant tb. Abeel t, manson mcguire a, desjardins ca, munsamy v, et al. Extensively drug resistant tuberculosis united states, 19932006.
Apr 30, 2020 reported cases of tuberculosis tb, multidrugresistant mdr tb, and extensively drugresistant xdr tb u. Pdf pdf icon 421k extensively drugresistant tuberculosis xdr tb what is extensively drugresistant tuberculosis xdr tb. Over the past 7 decades, mycobacterium tuberculosis has developed resistance to virtually every new drug used to treat tuberculosis, resulting recently in the global emergence of extensively drug resistant tuberculosis. Extensively drugresistant tuberculosis xdrtb definition. Jun 15, 2018 a complete highquality minion nanopore assembly of an extensively drug resistant mycobacterium tuberculosis beijing lineage strain identifies novel variation in repetitive peppe gene regions arnold bainomugisa, 1, 2, tania duarte, 1 evelyn lavu, 3 sushil pandey, 4 chris coulter, 4 ben j. This means that many of the common medications including isoniazid, rifampin, fluoroquinolones, and at least one. A convenience sample of 309 drugsusceptible and 342 multidrugresistant mdr tb isolates, collected july 2008july 2009, were characterized by spoligotyping, dna fingerprinting, insertion site mapping, and targeted dna sequencing. We investigated treatment with 3 oral drugs, bedaquiline b, pretomanid pa and linezolid l, bpal, with tb bactericidal activity and little preexisting resistance.
Xdrtb strains have arisen after the mismanagement of individuals with multidrug resistant tb mdrtb. Background extensively drugresistant tuberculosis has been reported in 45 countries, including countries with limited resources and a high burden of tuberculosis. In order to shorten the course of treatment and its effectiveness, it is essential to gain an indepth insight into the drug resistance mechanisms of mycobacterium tuberculosis m. Extensively drugresistant tb xdr tb is a rare type of multidrugresistant tuberculosis mdr tb that is resistant to isoniazid and rifampin, plus any fluoroquinolone and at least one of three injectable secondline drugs i. The patients were diagnosed wit extensively h pre drug resistant tuberculosis prexdr tb whose prognosis was fatal in democratic republic of congo drc. The treatment of tb with drug resistant organisms is more complicated and difficult and should be done by or in consultation with experts. National tb surveillance system, 19931999 and 20002006 references comments. Multi drug resistant tuberculosis mdrtb is a form of tuberculosis tb infection caused by bacteria that are resistant to treatment with at least two of the most powerful firstline antitb medications drugs, isoniazid and rifampin. Apr 30, 2020 a relatively rare type of multidrug resistant tuberculosis mdrtb. Jun 05, 2007 extensively drugresistant tuberculosis xdrtb. Scrutinizing the drug resistance mechanism of multi. Rates of default from treatment have been high, despite psychosocial support, increasing particularly since programme scaleup in 2007. Although tb control has been effective in some regions of the world, the gains are threatened by the increasing burden of multidrugresistant mdr, resistant to at least isoniazid and rifampicin and extensively drugresistant xdr, resistant to isoniazid and rifampin, plus any. Jul 04, 2007 witness the controversy generated by us citizen andrew speaker, whom the us centers for disease control and prevention cdc detained and isolated because he was diagnosed with pulmonary disease caused by extensively drug resistant tuberculosis xdrtb.
The spread of multidrug resistant mdr strains ie, strains resistant to both isoniazid and rifampicin has represented a major threat to tb control since the 1990s. Extensively drug resistant tuberculosis xdrtb is defined as tuberculosis caused by a mycobacterium tuberculosis strain that is resistant to at least rifampicin and isoniazid among the firstline antitubercular drugs multidrug resistant tuberculosis. The consolidated action plan to prevent and combat multidrug and extensively drugresistant tuberculosis mxdrtb in the who european region 20112015 has been developed to strengthen and intensify efforts to address the alarming problem of drugresistant tb in the region. Evolution of extensively drugresistant mycobacterium. Pdf development of extensively drugresistant tuberculosis. Patients with extensively drug resistant tuberculosis received daily, supervised therapy with an average of 5. Xdr tuberculosis has evolved in several tuberculosisendemic countries to drugincurable or programmatically incurable tuberculosis totally drugresistant tuberculosis. Emergence of extensively drug resistant tuberculosis.
Scrutinizing the drug resistance mechanism of multi and. Drugresistant tuberculosis also jeopardises tuberculosis control through its economic effect, because the high cost of managing drugresistant tuberculosis is not. The diagnosis and treatment of drugresistant strains of m. Extensively drugresistant tuberculosis united states. Xdrtb strains have arisen after the mismanagement of individuals with multidrug resistant tb mdrtb almost one in four people in the world is infected with tb bacteria.
Extensively drugresistant tuberculosis xdrtb is defined as tuberculosis caused by a mycobacterium tuberculosis strain that is resistant to at least rifampicin and isoniazid among the firstline antitubercular drugs multidrugresistant tuberculosis. Ural genetic family is a part of the euroamerican lineage of mycobacterium tuberculosis and is endemic in northern eurasia former soviet union fsu. A complete highquality minion nanopore assembly of an. Some forms of tb are also resistant to secondline medications, and are called extensively drugresistant tb. In 2006, the first cases of mdr strains with further resistance to fluoroquinolone and injectable drugs were described and named extensively drugresistant tb xdrtb. Citc is a project of the university of california, san francisco, funded by the centers for. Now figuring among tb low incidence countries, it has since the 1990s reported multidrug resistant and extensively drug resistant. Previous treatment is a common risk factor for extensively drugresistant and multidrugresistant tuberculosis. Extensively drug resistant tuberculosis xdrtb occurs when a mycobacterium tuberculosis strain becomes resistant to the firstline antitb drugs isoniazid and rifampin, plus any fluoroquinolone and at least one of the three secondline injectable drugs. Summaries of unpublished data used for the recommendations 1. Extensively drugresistant tuberculosis an overview. Swendiman and nancy lee jones legislative attorneys american law division summary the recent international saga of a traveler with xdrtb, a drugresistant form of tuberculosis, has placed a spotlight on existing mechanisms to contain contagious.
A survival guide for clinicians, third edition was created through a collaboration of the curry international tuberculosis center citc and the state of california department of public health, tuberculosis control branch cdph. The patients were diagnosed witextensively h pre drugresistant tuberculosis prexdr tb whose prognosis was fatal in democratic republic of congo drc. Using genomics to understand the origin and dispersion of multidrug and extensively drug resistant tuberculosis in portugal. Factors driving the increase in drugresistant tuberculosis tb in the eastern cape province, south africa, are not understood. A rare and serious type of the disease is called extensively drugresistant tb. Mdr tb which is also resistant to a fluoroquinolone and any secondline injectable drug, is called xdr tb, which means extensively drug resistant.
Preventing this amplification of resistance will likely improve clinical. There are a series of definitions used in describing the different the term preextensively drugresistant tb pre xdrtb refers to an isolate of m. We defined extensively drugresistant tb xdrtb as mdrtb with further resistance to. Tuberculosis tb is the leading infectious cause of death worldwide, and the problem is worsening as it becomes increasingly resistant to available medicines. Multidrugresistant mdr tuberculosis and extensively drugresistant xdr tuberculosis have become an important health problem in many countries of the who european region and currently threaten global efforts to control tuberculosis. Multidrugresistant tuberculosis mdrtb is a form of tuberculosis tb infection caused by bacteria that are resistant to treatment with at least two of the most powerful firstline antitb medications drugs, isoniazid and rifampin. The spread of multidrugresistant mdr strains ie, strains resistant to both isoniazid and rifampicin has represented a major threat to tb control since the 1990s. Risk factors associated with default from multi and. Fact sheets drugresistant tb extensively drugresistant. Emergence of new forms of totally drugresistant tuberculosis bacilli. Extensively drugresistant tuberculosis xdrtb in addition to inh and rif is also resistant to the best secondline drugs, the fluoroquinolones and an injectable such as kanamycin or capreomycin. The emergence of drugresistant tuberculosis tb is of major concern to tb control in south africa. The world health organization planning and evaluation report reports on the status of access to diagnosis and treatment of multidrugresistant tuberculosis and. A more detailed description of these findings and preliminary data from the u.
The worldwide emergence of extensively drug resistant tuberculosis xdr tb and a provisional definition for this form of tb were first reported in november 2005 1,2. Tackling the spread of drugresistant tuberculosis in europe. Extensively drugresistant tb page 2 of 7 september 2016 capreomycin, or kanamycin. Predictors of extensively drugresistant pulmonary tuberculosis. Over the past 7 decades, mycobacterium tuberculosis has developed resistance to virtually every new drug used to treat tuberculosis, resulting recently in the global emergence of extensively drugresistant tuberculosis. Extensively drugresistant tb xdrtb is a form of mdrtb which is also resistant to two groups of secondline antitb medicines, making it more difficult to treat. This field guide for the management of drugresistant tuberculosis is a practical tool intended to help health workers in the clinical and operational management of the disease with special focus on the introduction, implementation and management of the 9month. These strains were long described as drug susceptible and of low virulence, but recent studies reported an increasing circulation of the multidrugresistant mdr and extensively drugresistant xdr ural strains. Preextensively drug resistant tuberculosis prexdrtb is a comparatively new term and is defined as tb with resistance to rifampicin rmp and isoniazide inh with additional resistance to either a flq fluoroquinolone or isl injectable second line agent but not against both these drugs simultaneously. We surveyed the network of supranational reference laboratories for m. In an individual, treatment with a single new drug results in acquired drug resistance within weeks to months. Oct 22, 2018 ural genetic family is a part of the euroamerican lineage of mycobacterium tuberculosis and is endemic in northern eurasia former soviet union fsu. Evidencebased resource summary healthy people program. Background the medecins sans frontieres project of uzbekistan has provided multidrugresistant tuberculosis treatment in the karakalpakstan region since 2003.
The epidemiology, pathogenesis, transmission, diagnosis, and. Who treatment guidelines for drugresistant tuberculosis, 2016 update. Bedaquiline is arguably one of the molecules of the future in the management of ultra resistant tuberculosis. The treatment of tb with drugresistant organisms is more complicated and difficult and should be done by or in consultation with experts. What is the treatment for drugresistant tuberculosis. Clinical and operational value of the extensively drugresistant tuberculosis definition. Despite the low in vitro mutation rate of mycobacterium tuberculosis 1,2, cases of extensively drugresistant tuberculosis xdrtb are now frequently reported 3,4. Consolidated action plan to prevent and combat multidrug. Extensively drugresistant tb xdrtb is defined as tb due to bacilli resistant to any fluoroquinolone, and at least one of three injectable secondline drugs capreomycin, kanamycin, and amikacin, in addition to isoniazid and rifampicin. Extensively drug resistant tuberculosis xdr tb is a relatively rare type of multidrug resistant tuberculosis mdr tb. Patients with extensively drug resistant tuberculosis tb have limited treatment options with historically poor outcomes.
Tuberculosis contact investigation in low prevalence countries. Who consolidated guidelines on drugresistant tuberculosis. It is resistant to almost all drugs used to treat tb, including the two best firstline drugs. Mdrtb in addition to resistance to any fluroquinolones and at least one of three. Evolution of extensively drugresistant tuberculosis over four decades. Extensively drug resistant tuberculosis xdrtb in addition to inh and rif is also resistant to the best secondline drugs, the fluoroquinolones and an injectable such as kanamycin or capreomycin. Multidrug resistance, observed in 7895 samples, emerged with the acquisition of a typical rpob mutation together with a compensatory rpoc mutation in the 1980s.
Extensively drugresistant tuberculosis,taiwan article pdf available in emerging infectious diseases 145. The evolution of drug resistance is a major impediment to current antituberculosis efforts. Extensively drugresistant tuberculosis xdr tb is a relatively rare type of multidrugresistant tuberculosis mdr tb. These were the same patients that were seen in the tugela ferry outbreak in rural kwazulunatal province from 20052007. Although tb control has been effective in some regions of the world, the gains are threatened by the increasing burden of multidrug resistant mdr, resistant to at least isoniazid and rifampicin and extensively drug resistant xdr, resistant to isoniazid and rifampin, plus any. Mycobacterium tuberculosis strains that are resistant to an increasing number of secondline drugs used to treat multidrugresistant tuberculosis mdrtb are becoming a threat to public health worldwide. Multi drug resistance, observed in 7895 samples, emerged with the acquisition of a typical rpob mutation together with a compensatory rpoc mutation in the 1980s. Recent studies have suggested that resistance to slds has arisen as a new threat 6 7 8, leading to extensively drugresistant tuberculosis xdrtb, which has been found in 117 countries. First use of bedaquiline in democratic republic of congo. Bedaquiline, pretomanid and linezolid for treatment of. Delamanid, a nitroimidazole, is a new tuberculosis tb drug developed to address some of the adverse reactions and related adherence difficulties associated with currently available mediations for treating drugresistant tb. In 2006, the first cases of mdr strains with further resistance to fluoroquinolone and injectable drugs were described and named extensively drug resistant tb xdrtb.
Jun 02, 2009 risk determinants from patients demographic characteristics, socioeconomic variables, and tuberculosisrelated data or hiv status. A complete highquality minion nanopore assembly of an extensively drugresistant mycobacterium tuberculosis beijing. Extensively drugresistant xdr tuberculosis tb may arise in individuals on treatment for multidrugresistant mdr tb. Witness the controversy generated by us citizen andrew speaker, whom the us centers for disease control and prevention cdc detained and isolated because he was diagnosed with pulmonary disease caused by extensively drugresistant tuberculosis xdrtb. Consolidated action plan to prevent and combat multidrug and. Extensively drugresistant tuberculosis xdr tb what is extensively drugresistant tuberculosis xdr tb. Xdrtb strains have arisen after the mismanagement of individuals with multidrugresistant tb mdrtb almost one in four people in the world is infected with tb bacteria. A potential threat to this is the lack of effective treatment for intolerant or nonresponsive multi drug resistant tb mdrtb, with resistance to isoniazid and rifampicin or extensively drug resistant tb xdrtb, mdrtb with additional resistance. Multidrugresistant tuberculosis mdrtb is defined as isolates resistant to at least. A patient with extensively drug resistant tb was successfully treated in 2017. Who consolidated guidelines on drugresistant tuberculosis treatment 6 key definitions2 drugsusceptibility testing dst refers to invitro testing using either phenotypic methods to determine susceptibility or molecular techniques to detect resistanceconferring mutations to a medicine 7,8. Emergence and spread of extensively and totally drug. Development of extensively drugresistant tuberculosis. Xdr tb is also resistant to the best secondline medications.
Tuberculosis tb is still a public health priority in both low and highresource countries. Comprehensive treatment of extensively drugresistant. Pre extensively drug resistant tuberculosis prexdrtb is a comparatively new term and is defined as tb with resistance to rifampicin rmp and isoniazide inh with additional resistance to either a flq fluoroquinolone or isl. Tackling the spread of drugresistant tuberculosis in. Multidrug and extensively drugresistant tuberculosis m xdrtb is a manmade phenomenon that emerges as a result of inadequate treatment of tuberculosis andor poor airborne infection control in health care facilities and congregate settings. Multi drug resistant tb in bangladesh in new cases is1. In this study, we evaluated the contribution of 26 drug efflux pumps plus target gene mutations to the drug resistance levels in multi drug resistant mdrpre extensively drug resistant prexdr. New epidemic cluster of preextensively drug resistant. There was independent acquisition of fluoroquinolone and aminoglycoside resistance, and evidence of local transmission of extensively drug resistant xdr strains from 2009. In this study, we evaluated the contribution of 26 drug efflux pumps plus target gene mutations to the drug resistance levels in multidrug resistant mdrpreextensively drugresistant prexdr.
The vision of the end tb strategy of the world health organization who is for a world free of tuberculosis tb by the year 2035. Only when the bacteria become active do people become ill with tb. Of 95 patients with extensively drugresistant tuberculosis of whom about 60% were negative for the human immunodeficiency virus we identified in cape town, south africa, between 2006 and 2008. Worldwide emergence of extensively drugresistant tuberculosis.
Bedaquiline is arguably one of the molecules of the future in the management of ultraresistant tuberculosis. The epidemiology, pathogenesis, transmission, diagnosis. Drug resistant forms of tb including multidrug resistant tb mdrtb and extensively drug resistant tb xdrtb are deadlier and much more complicated to treat than drug susceptible. The term introduced first in 2005 but became popularly known as such when a survey study found that in rural south africa a large portion of patients with mdrtb had extensive drug resistance. These strains were long described as drug susceptible and of low virulence, but recent studies reported an increasing circulation of the multidrug resistant mdr and extensively drug resistant xdr ural strains. Using genomics to understand the origin and dispersion of. Revised definition of extensively drugresistant tuberculosis. Full text multidrugresistant tuberculosis in a referral. Extensively drugresistant tuberculosis xdrtb is a form of tuberculosis caused by bacteria that are resistant to some of the most effective antitb drugs. The worldwide emergence of extensively drug resistant tuberculosis xdr tb and a provisional definition for this form of tb were first reported in november 2005. Drugresistant tuberculosis causes a strain on health systems because of the chronic nature of the disease, and because of the risk of transmission to healthcare workers. Patients with multidrug resistant or rifampicin resistanttb require treatment with second line treatment regimens, which are more complex than those resistant tb. National tb surveillance system ntss were published in 2006. Who treatment guidelines for drug resistant tuberculosis.