TABLE 2

TB Cases and Rates Among Children Who Are <5 Years Old by Birth Origin and Parents’ Birth Origin in 20 Jurisdictions in the United States

TotalForeign BornUS Born With at Least 1 Foreign-Born ParentUS Born of US-Born parents
No. of TB cases in children <5 y olda (%)364 (100)61 (16.7)194 (53.3)76 (20.9)
Annualized case number217.1236.75117.1843.86
Population <5 y of age estimated from US Census ACS 2005–2007 (%)8 450 150 (100)152 890 (1.8)2 433 890 (28.8)5 863 360 (69.4)
TB rateb (95% CI)2.57 (2.23–2.91)24.03 (16.21–31.85)4.81 (3.94–5.68)0.75 (0.53–0.97)
  • ACS, American Community Survey.

  • a The total number of 364 includes 33 (9%) children, not shown in the other columns, with unknown parental birth countries.

  • b TB rates per 100 000 population, annualized and adjusted for study enrollment period. To estimate the impact of excluding the 33 children with unknown parental birth country on incidence, the entire annualized number (19.33) was added to each US-born category, and TB incidence and 95% CIs were calculated to be 5.61 (4.67–6.55) for US-born children with at least 1 foreign-born parent; 1.08 (0.81–1.35) for US born with US-born parents.