Slide 15. TB Case Rates in U.S.-born vs. Foreign-born Persons, United States, 1993–2008. TB rates in foreign-born persons remain higher than those in the U.S.-born population. From 1993 through 2008, the rates in U.S.-born persons decreased from 7.4 per 100,000 to 2.0, whereas the rates in foreign-born persons decreased from 34.0 per 100,000 to 20.3.