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Diagnosis and exclusion of all suspected cases found during the whole investigation of close contacts in the school. Smear−, smear-negative; Smear+, smear-positive; Culture−, culture-negative; Culture+, culture-positive; GeneXpert MTB/RIF−, GeneXpert MTB/RIF negative; GeneXpert MTB/RIF+, GeneXpert MTB/RIF positive; TST, tuberculin skin testing; CXR, chest radiography/chest X-ray; TB, tuberculosis.
