|Slide 20. Primary MDR TB, United States, 1993–2009. This graph focuses on trends in primary MDR TB
(based on initial isolates from persons with no prior history of TB) in the United States from 1993 through
2009. The number of primary MDR TB cases, represented by bars, steadily declined from 407 in 1993 to 115
in 2001. Since then the total number of primary MDR TB cases has fluctuated from 89 to 132 cases, with 94
cases reported for 2009. Primary MDR TB, shown by the line, decreased from 2.5% in 1993 to approximately
1.1% in 1997, and remained approximately at 1.1% up to 2009 when it increased to 1.2%.
2009 Surveillance Slides Main