<qa>  What is the DNA-based vaccine designed to boost the immune systems responses against many HIVHIV-1-infected patients who have been treated with anti-HIV drugs for a long time may have weakened immune responses to HIV. The DNA-based vaccine in this study is designed to boost the immune systems responses against many HIV-1 proteins. The main purposes of this study are to test the safety of this HIV vaccine EP HIV-1090 and to test whether the vaccine can stimulate immune system responses in people who have HIV-1 infection. 