AP BIOLOGY

Detailed explanation-1: -If the person’s CD4 cell count falls below 200, their immunity is severely compromised, leaving them susceptible to infections and death. Someone with a CD4 count below 200 is described as having an advanced HIV disease (AHD). HIV viral load measures the amount of virus in the blood.

Detailed explanation-2: -But if you have certain illnesses like HIV or cancer, your white blood cell count can drop to very low levels. It can also drop if you are on medicine that weakens your immune system. This includes medicines, such as chemotherapy.

Detailed explanation-3: -CD4 Cell Count The normal range for an HIV-negative person is 500 to 1, 500. The goal of HIV treatment is to keep this number as high as possible for as long as possible. A CD4 count below 200 indicates an AIDS diagnosis and raises the risk for opportunistic infections.

Detailed explanation-4: -The immune system has many kinds of white blood cells to fight infections. HIV finds the white blood cells, called CD4 cells. HIV gets inside the CD4 cell and makes copies of itself. Then, HIV kills the CD4 cell and the new HIV copies find other CD4 cells to get inside and start the cycle again.