WHO_HTM_TB_2013_04_7

(a) Systematic screening for active TB may be considered for geographically
defined subpopulations with extremely high levels of undetected TB (1%
prevalence or higher).
(b) Systematic screening for active TB may be considered also for other
subpopulations that have very poor access to health care, such as people
living in urban slums, homeless people, people living in remote areas with
poor access to health care, and other vulnerable or marginalized groups
including some indigenous populations, migrants and refugees.