Contact tracing in low-prevalence TB countries, for both pulmonary and non-pulmonary TB, is an essential intervention to identify and reduce the number of infected patients that will progress to active disease. This is the key for effective TB control.
Conclusion Overall there was a high concordance between the two IGRAs. Four of the 12 with positive IGRA results had a past history of TB making interpretation uncertain. The low rate of indeterminate results likely reflects the high CD4 counts among this patient group.
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