2003 Surveillance Slides

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Primary Anti-TB Drug Resistance

United States, 1993-2003

Slide 19: Primary Anti-TB Drug Resistance, United States, 1993-2003. Primary drug resistance is shown for the previous 11 years. The graph starts in 1993 because this is the year in which the individual TB case reports submitted to the national surveillance system began collecting information on initial susceptibility test results (for isolates) from patients with culture-positive TB. Data were available for more than 85% of culture-positive cases for each year. Primary resistance was calculated by using data from persons with no reported prior TB episode. Resistance to at least isoniazid remained between 7% and 8%. However, resistance to at least isoniazid and rifampin, known as multidrug-resistant TB (MDR TB), decreased from 2.5% in 1993 to approximately 1.0% each year during 1996-2003.

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Last Reviewed: 05/18/2008
Content Source: Division of Tuberculosis Elimination
National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention

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