Final answer:
After a positive result from a rapid HIV test, the next step is to confirm the diagnosis with an immunoblot like the Western blot or a nucleic acid test like RT-PCR. Only a positive result from this subsequent testing confirms an HIV infection.
Step-by-step explanation:
If you receive a positive result from a rapid HIV 1 & 2 serological test, the next action to take is to undergo a confirmatory test. Because there is always a concern about cross-reactivity and false positives, initial tests like the rapid card, or indirect ELISA, need to be validated. A common confirmatory test is an immunoblot, such as the Western blot, which identifies the presence of specific HIV peptides. Alternatively, a nucleic acid test (NAT) like reverse transcriptase PCR (RT-PCR) or a nucleic acid antigen test could be used to confirm the presence of the virus. Only after a positive result from the confirmatory test can a definitive diagnosis be made. It's essential to follow up this diagnosis with appropriate medical care and counseling.