Final answer:
Viral load refers to the amount of virus in a sample of an infected individual's blood and is used to evaluate the effectiveness of therapy in HIV-positive patients.
Step-by-step explanation:
The term viral load, when speaking of HIV/AIDS, refers to the amount of virus in a sample of an infected individual's blood. It is measured in terms of the number of DNA copies and sometimes organisms present in the sample. The viral load provides information about the level of active virus replication in the body and is used to evaluate the effectiveness of therapy in HIV-positive patients.