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Testing every 2 to 3 years is recommended for children who have been exposed to high-risk individuals and at age 4 to 6 for those living in high prevalence areas, those who travel to countries with high prevalence, and those whose parents have emigrated from countries with high prevalence of TB.
Selecting a Test to Detect TB Infection. 1  IGRAs are the preferred method of testing for: Groups of people who have poor rates of return for TST reading and interpretation (e.g., homeless persons) Persons who have received BCG vaccination. 2  TST is the preferred method for testing for: Children under the age of 5 years.