What is the standard procedure used for initial screening of HIV infection?

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Isolation of the virusPerforming Western blot prior to ELISAConducting ELISA first, then confirming with Western blotUsing polymerase chain reaction (PCR)

Explanation

The common approach for HIV screening involves first using the ELISA test to detect antibodies, followed by confirmation with the Western blot technique. Virus isolation and PCR are not typically used for initial screening, and Western blot is not performed before ELISA.