The HIV antibody
test determines whether the virus has stimulated the body to produce immune substances, or antibodies.
If HIV antibodies are found in the blood, the result is checked by means of a second blood test.
The
direct virus test, which is based on the polymerase chain reaction
(PCR), permits direct qualitative demonstration of the virus. Determination of the amount of virus
present in the blood, i.e. the ‘viral burden’, is an aid to
reliable monitoring of HIV infection and permits rational use of available therapies.
Resistance
tests determine which medicines are effective against the virus – an essential precondition for effective
treatment.
