Although the overall incidence of tuberculosis has been declining in the United States, it remains an important public health concern, particularly among immigrants, homeless persons, and persons infected with human immunodeficiency virus. Patients who present with symptoms of active tuberculosis (e.g., cough, weight loss, or malaise with known exposure to the disease) should be evaluated. Three induced sputum samples for acid-fast bacillus smear and culture should be obtained from patients with findings of tuberculosis or suspicion for active disease. If the patient has manifestations of extrapulmonary tuberculosis, smears and cultures should be obtained from these sites. Most patients with active tuberculosis should be treated initially with isoniazid, rifampin, pyrazinamide, and ethambutol for eight weeks, followed by 18 weeks of treatment with isoniazid and rifampin if needed. Repeat cultures should be performed after the initial eight-week treatment.
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