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Testing for antibodies to human immunodeficiency virus type 2 in the United States.
MMWR. Recommendations and Reports : Morbidity and Mortality Weekly Report. Recommendations and Reports 1992 July 18
The Food and Drug Administration (FDA) has recommended that all donated blood be screened for antibodies to human immunodeficiency virus type 2 (HIV-2) beginning no later than June 1, 1992. This article provides CDC recommendations for the diagnosis of HIV-1 and HIV-2 infections in persons being tested in settings other than blood centers and CDC/FDA guidelines for serologic testing with combination HIV-1/HIV-2 screening enzyme immunoassays (EIAs). Epidemiologic data indicate that the prevalence of HIV-2 infections in persons in the United States is extremely low. Therefore, CDC does not recommend routine testing for HIV-2 in settings other than blood centers. However, when HIV testing is indicated, tests for antibodies to both HIV-1 and HIV-2 should be obtained if epidemiologic risk factors for HIV-2 infection are present, if clinical evidence exists for HIV disease in the absence of a positive test for antibodies to HIV-1, or if HIV-1 Western blot results exhibit the unusual indeterminate pattern of gag plus pol bands in the absence of env bands. The following procedures are recommended if testing for both HIV-1 and HIV-2 is performed by means of a combination HIV-1/HIV-2 EIA. A repeatedly reactive specimen by HIV-1/HIV-2 EIA should be tested by HIV-1 Western blot (or another licensed HIV-1 supplemental test). A positive result by HIV-1 Western blot confirms the presence of antibodies to HIV, and testing for HIV-2 is recommended only if HIV-2 risk factors are present. If the HIV-1 Western blot result is negative or indeterminate, an HIV-2 EIA should be performed. If the HIV-2 EIA is positive, an HIV-2 supplemental test should be performed.
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