Patients exposed to TB may have negative results on purified protein derivative (PPD) skin testing initially; however, they should be retested after 12 weeks. In the meantime, they should receive preventive treatment.5 If the results of the PPD test remain negative, preventive therapy may be discontinued. Standard preventive therapy consists of isoniazid given daily for 9 months.
- Start preventive treatment.
5. Clinical policies and protocols. 3rd ed. Bureau of Tuberculosis Control. New York City Department of Health. June 1999. Available at http://www.nyc.gov/html/doh/pdf/tb/manu.pdf. Accessed 2 Jan 2003.
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