The invention provides oligonucleotide primers selected from the group
consisting of a nucleotide sequence of the gag, vpr, and pol genes of
HIV-1 Bru, HIV-1 Mal, HIV-1 Eli, HIV-2 ROD, and SIV MAC; the nef, vif,
and vpx genes of HIV-2 ROD and SIV MAC; and the env, nef, vif, and vpu
genes of HIV-1 Bru, HIV-1 Mal and HIV-1 Eli and nucleotide sequences
complementary thereto.