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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.
National Guidelines for Tuberculosis Control Program in Afghanistan 66 Contact Screening and Preventive Therapy General Concept and Strategy Household contacts of TB SS+ adults must be actively traced to identify newly infected children less than five years of age.