The types of tests needed for HIV-2 infection include:
1. 4th generation HIV-1/2 antigen-antibody test: This test can identify and distinguish between HIV-1 and HIV-2.
2. Viral load testing: This test measures the amount of HIV-2 in the blood and can be helpful in confirming an HIV-2 diagnosis and checking the effectiveness of treatment. However, it's important to note that viral load tests may not always give reliable results, as up to 40% of people with HIV-2 have no detectable virus in their blood.
3. Baseline resistance test: Unlike HIV-1, HIV-2 does not require a baseline resistance test before starting treatment.
4. CD4 cell count: Regular monitoring of CD4 cell count is important for both HIV-1 and HIV-2 patients to assess the immune system's response to the virus and the effectiveness of treatment.
It's important to consult with a healthcare professional for proper diagnosis and management of HIV-2 infection.