The purpose of this study is to find out more about how persons respond to
HIV-1 infection if they have received an experimental HIV-1 vaccine before
they became HIV-infected. It is important to study people who have been given
experimental HIV vaccines and who later became HIV-infected for several
reasons. First, if HIV infection is found and then cleared, it is important to
note the relationship between the virus and the vaccine. This may give an
understanding of the immunity. A second reason is to better understand the
immune response in those who received a vaccine compared to those who received
placebo (no vaccine). If the vaccine does not prevent HIV infection, it will
be important to study the progression of the disease. Understanding the immune
response in vaccinated patients after infection and the impact on symptoms and
disease progression may give valuable information for future vaccine trials
and the effectiveness of HIV vaccines.