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  • Title: The validity of HIV testing using sputum from suspected tuberculosis patients, Botswana, 2001.
    Author: Talbot EA, Hone NM, Moffat HJ, Lee EJ, Moeti TL, Mokobela K, Mbulawa M, Binkin NJ, Wells CD, Kenyon TA.
    Journal: Int J Tuberc Lung Dis; 2003 Aug; 7(8):710-3. PubMed ID: 12921145.
    Abstract:
    SETTING: The World Health Organization recommends that sentinel HIV surveillance be conducted on tuberculosis patients. However, serum HIV testing is complicated in the TB clinic context, and may not be acceptable to patients. DESIGN: To determine the utility of the OraQuick HIV-1/2 Assay for the detection of HIV antibodies in sputum, we consecutively enrolled adult in-patients in Botswana who had sputum sent for acid-fast bacilli testing and serum sent for HIV ELISA testing. OraQuick HIV-1/2 Assay was applied to gingival secretions according to manufacturer's guidelines, and was also dipped into sputum specimens. A subset of 60 sputum specimens was also serially tested up to 72 hours after collection. RESULTS: Of 377 patients, 84% were HIV-positive by serum ELISA. Compared with serum ELISA, the OraQuick HIV-1/2 Assay detected HIV in gingival secretions with 98.4% sensitivity and 98.3% specificity (95%CI 97-99 and 92-100, respectively), and 97.1% sensitivity and 98.3% specificity on initial sputum specimens (95%CI 95-99 and 92-100, respectively). OraQuick HIV-1/2 Assay performance on sputum declined slightly when tested up to 72 hours after collection. CONCLUSIONS: When applied to sputum specimens, the OraQuick HIV-1/2 Assay demonstrates sensitivity and specificity comparable to its intended application on gingival secretions. This novel testing method will be valuable in anonymous sentinel HIV surveillance surveys among tuberculosis patients.
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