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Preventive therapy for TB exposure/infection Screen all children in close contact with an infectious pulmonary TB case for TB disease. Screening includes clinical history/examination and, if available, chest X-ray and tuberculin skin test (TST). Give antituberculosis treatment if the diagnosis of TB disease is confirmed or suspected. Indications for TB Preventive Therapy: » All asymptomatic children < 5 years of age, or HIV-infected irrespective of age, i.e. clinically normal, normal chest X-ray and TST positive or negative, in close contact with an infectious pulmonary TB case should receive isoniazid preventive therapy (IPT). » Children < 5 years of age, or HIV-infected irrespective of age, who have had no previous TB treatment or preventive therapy, are asymptomatic without a history of close contact with an infectious pulmonary TB case but found to have a positive TST. » Previous isoniazid preventive therapy or treatment does not protect the child against subsequent TB exposure/infection. If there is re-exposure to an infectious pulmonary TB case after completion of 6 months of chemotherapy, children (< 5 years or HIV-infected) should receive IPT after each episode of documented TB exposure for 6 months. In cases of re-exposure to infectious source cases while the child is on IPT, the duration of IPT should continue for as long as the source case remains infectious. Preventive therapy in case of drug-susceptible TB contact: Isoniazid, oral, 10 mg/kg daily for 6 months. Preventive therapy in case of drug-resistant TB contact: Isoniazid monoresistance: Rifampicin, oral, 15 mg/kg daily for 4 months. Rifampicin monoresistance: Isoniazid, oral, 10 mg/kg daily for 6 months. MDR-TB: Isoniazid, oral, 15-20mg/kg daily for 6 months Ethambutol, oral, 20-25mg/kg daily for 6 months Levofloxacin 15-20mg/kg daily for 6 months Refer case if simplification of prophylaxis regimen is required XDR-TB: Close follow-up for two years. Ensure household infection control practices are observed. Refer all cases.