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1999 Surveillance Slides

Primary Anti-TB Drug Resistance, United States, 1993-1999

Slide 14.  Primary Anti-TB Drug Resistance, United States, 1993-1999.
Slide 14. Primary Anti-TB Drug Resistance, United States, 1993-1999. Primary drug resistance is estimated for the previous 7 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 estimated by using data from persons with no reported prior TB episode. There was a minimal decrease in resistance to at least isoniazid, from 8% in 1993 to 7% in 1999. However, resistance to at least isoniazid and rifampin (or MDR TB) decreased from 2.5% in 1993 to 1.1% in 1999, representing an actual decrease from more than 400 MDR TB cases to less than 150 in 1999.


Released October 2008
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