1 percent of the population is a low incidence of hiv, every elisa test is good at 3 months, that you have been told already, with each generation of test they get to detect a little bit earlier,
elisa has been used to detect many viruses other than hiv, its an extremely reliable way to
test for a virus, to culture for the virus takes to long. i doubt if they still use first generation test unless its home access test, also rapid test like oraquick are equilivant to 2 nd gen testing.