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 Table of Contents  
Year : 2016  |  Volume : 5  |  Issue : 5  |  Page : 161

Overview of drug-resistant tuberculosis worldwide

Mycobacteriology Research Centre, National Research Institute of Tuberculosis and Lung Disease, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Date of Web Publication17-Feb-2017

Correspondence Address:
Parissa Farnia
Mycobacteriology Research Centre, National Research Institute of Tuberculosis and Lung Disease, Shahid Beheshti University of Medical Sciences, Tehran
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Source of Support: None, Conflict of Interest: None

DOI: 10.1016/j.ijmyco.2016.09.066

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Even in the 21st century, we are losing the battle against eradication of tuberculosis (TB). In 2015, 9.6 million people were estimated to have fallen ill with TB, of which 1.5 million people died. This is the real situation despite the well-structured treatment programs and availability of effective treatment options since the 1950s. The high mortality rate has been associated with other risk factors, such as the HIV epidemic, underlying diseases, and decline of socioeconomic standards. Furthermore, the problem of drug resistance that was recognized in the early days of the chemotherapeutic era raises serious concerns. Although resistance to a single agent is the most common type, resistance to multiple agents is less frequent but of greater concern. The World Health Organization estimated approximately 5% of all new TB cases involved multidrug-resistant (MDR)-TB. The estimation for MDR-TB is 3.3% for new cases, and 20.5% for previously treated cases. Failure to identify and appropriately treat MDR-TB patients has led to more dangerous forms of resistant TB. Based on World Health Organization reports, 5% of global TB cases are now considered to be extensively drug resistant (XDR), defined as MDR with additional resistance to both fluoroquinolones and at least one second-line injectable drug. XDR-TB had been reported by 105 countries by 2015. An estimated 9.7% of people with MDR-TB have XDR-TB. More recently, another dangerous form of TB bacillus was identified, which was named totally drug resistant (TDR-TB) or extremely drug resistant TB. These strains were resistant to all first- and second-line anti-TB drugs. Collectively, it is accepted that 2% of MDR-TB strains turn to be TDR-TB. This number, however, may not reflect the real situation, as many laboratories in endemic TB countries do not have proper facilities and updated protocols to detect the XDR or TDR-TB strains. Nevertheless, existing data emphasize the need for additional control measures, such as new diagnostic methods, better drugs, and more effective vaccines to prevent the spread of these strains around the world.

Keywords: Drug-resistant tuberculosis (DR-TB), Epidemiology, Extensively drug-resistant tuberculosis (XDR-TB), Totally drug-resistant tuberculosis (TDR-TB)

How to cite this article:
Velayati AA, Farnia P, Farahbod AM. Overview of drug-resistant tuberculosis worldwide. Int J Mycobacteriol 2016;5, Suppl S1:161

How to cite this URL:
Velayati AA, Farnia P, Farahbod AM. Overview of drug-resistant tuberculosis worldwide. Int J Mycobacteriol [serial online] 2016 [cited 2023 Feb 2];5, Suppl S1:161. Available from: https://www.ijmyco.org/text.asp?2016/5/5/161/200398

  Conflict of interest Top

The authors has no conflict of interest.

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