Global Trends in Resistance to Antituberculosis Drugs
Marcos A. Espinal, M.D., Dr.P.H., Adalbert Laszlo, Ph.D., Lone Simonsen, Ph.D., Fadila Boulahbal, Ph.D., Sang Jae Kim, Sc.D., Ana Reniero, Ph.D., Sven Hoffner, Ph.D., Hans L. Rieder, M.D., M.P.H., Nancy Binkin, M.D., M.P.H., Christopher Dye, D.Phil., Rosamund Williams, Ph.D., Mario C. Raviglione, M.D., for the World Health OrganizationInternational Union against Tuberculosis and Lung Disease Working Group on Anti-Tuberculosis Drug Resistance Surveillance
Background Data on global trends in resistance to antituberculosisdrugs are lacking.
Methods We expanded the survey conducted by the World HealthOrganization and the International Union against Tuberculosisand Lung Disease to assess trends in resistance to antituberculosisdrugs in countries on six continents. We obtained data usingstandard protocols from ongoing surveillance or from surveysof representative samples of all patients with tuberculosis.The standard sampling techniques distinguished between new andpreviously treated patients, and laboratory performance waschecked by means of an international program of quality assurance.
Results Between 1996 and 1999, patients in 58 geographic siteswere surveyed; 28 sites provided data for at least two years.For patients with newly diagnosed tuberculosis, the frequencyof resistance to at least one antituberculosis drug ranged from1.7 percent in Uruguay to 36.9 percent in Estonia (median, 10.7percent). The prevalence increased in Estonia, from 28.2 percentin 1994 to 36.9 percent in 1998 (P=0.01), and in Denmark, from9.9 percent in 1995 to 13.1 percent in 1998 (P=0.04). The medianprevalence of multidrug resistance among new cases of tuberculosiswas only 1.0 percent, but the prevalence was much higher inEstonia (14.1 percent), Henan Province in China (10.8 percent),Latvia (9.0 percent), the Russian oblasts of Ivanovo (9.0 percent)and Tomsk (6.5 percent), Iran (5.0 percent), and Zhejiang Provincein China (4.5 percent). There were significant decreases inmultidrug resistance in France and the United States. In Estonia,the prevalence in all cases increased from 11.7 percent in 1994to 18.1 percent in 1998 (P<0.001).
Conclusions Multidrug-resistant tuberculosis continues to bea serious problem, particularly among some countries of easternEurope. Our survey also identified areas with a high prevalenceof multidrug-resistant tuberculosis in such countries as Chinaand Iran.
Source Information
From the Communicable Diseases Cluster, World Health Organization, Geneva (M.A.E., L.S., C.D., R.W., M.C.R.); the International Union against Tuberculosis and Lung Disease, Paris (A.L., H.L.R.); the Laboratory Centre for Disease Control, Ottawa, Ont., Canada (A.L.); the Institut Pasteur, Algiers, Algeria (F.B.); the Korean Institute of Tuberculosis, Seoul, Republic of Korea (S.J.K.); the Instituto Panamericano de Protección de Alimentos y Zoonosis, Buenos Aires, Argentina (A.R.); the Swedish Institute for Infectious Disease Control, Stockholm (S.H.); and the Division of Tuberculosis Elimination, Centers for Disease Control and Prevention, Atlanta (N.B.).
Address reprint requests to Dr. Espinal at Communicable Diseases Control, Prevention, and Eradication, World Health Organization, 20 Ave. Appia, 1211 Geneva, Switzerland, or at espinalm{at}who.int.
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