Final answer:
The Western blot test is a popular confirmatory procedure for HIV infection.
Step-by-step explanation:
The popular confirmatory procedure for HIV infection is the Western blot test, also known as an immunoblot. This test is used to identify the presence of specific peptides from the HIV virus. The Western blot uses an HIV-specific monoclonal antibody-enzyme conjugate to detect and confirm the antibodies produced by the body in response to an HIV infection.