| http://www.w3.org/ns/prov#value | - If the EIA is positive (reactive), it must be followed by a second confirmatory test, such as the Western blot, to make a positive diagnosis.1 EIA tests that use body fluids other than blood to screen for HIV antibodies include the following: Oral Fluid Tests use oral fluid (not saliva) collected from the mouth using a special collection device.
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