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. 2009;4(2):e4370.
doi: 10.1371/journal.pone.0004370. Epub 2009 Feb 3.

Transmission of MDR and XDR tuberculosis in Shanghai, China

Ming Zhao  1 , Xia Li, Peng Xu, Xin Shen, Xiaohong Gui, Lili Wang, Kathryn Deriemer, Jian Mei, Qian Gao
Affiliations

Transmission of MDR and XDR tuberculosis in Shanghai, China

Ming Zhao et al. PLoS One. 2009.

Abstract

Background: Multidrug-resistant (MDR) and extensively drug-resistant (XDR) tuberculosis (TB) are global health problems. We sought to determine the characteristics, prevalence, and relative frequency of transmission of MDR and XDR TB in Shanghai, one of the largest cities in Asia.

Methods: TB is diagnosed in district TB hospitals in Shanghai, China. Drug susceptibility testing for first-line drugs was performed for all culture positive TB cases, and tests for second-line drugs were performed for MDR cases. VNTR-7 and VNTR-16 were used to genotype the strains, and prior treatment history and treatment outcomes were determined for each patient.

Results: There were 4,379 culture positive TB cases diagnosed with drug susceptibility test results available during March 2004 through November 2007. 247 (5.6%) were infected with a MDR strain of M. tuberculosis and 11 (6.3%) of the 175 MDR patients whose isolate was tested for susceptibility to second-line drugs, were XDR. More than half of the patients with MDR and XDR were newly diagnosed and had no prior history of TB treatment. Nearly 57% of the patients with MDR were successfully treated.

Discussion: Transmission of MDR and XDR strains is a serious problem in Shanghai. While a history of prior anti-TB treatment indicates which individuals may have acquired MDR or XDR TB, it does not accurately predict which TB patients have disease caused by transmission of MDR and XDR strains. Therefore, universal drug susceptibility testing is recommended for new and retreatment TB cases.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. Study population of cases of drug resistant tuberculosis in Shanghai, March, 2004–November, 2007.
TB = tuberculosis. MDR = multidrug-resistant. MOTT = Mycobacteria other than tuberculosis.
See this image and copyright information in PMC

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