The immune-deficiency becomes marked once the HIV starts destroying 
1. Macrophages
2. T helper cells
3. B lymphocytes
4. Natural killer cells 

The most standard HIV screening blood test:

The early screening test for HIV infection is :
1. ELISA
2. Western Blot
3. Culture of HIV
4, Detection of opportunistic infections

Opportunistic infections appear in AIDS patients when the HIV has destroyed :
1. Macrophages
2. T cytotoxic cells
3. T helper cells
4. B cells

AIDS is characterized by the presence of: