Dual-virus competition assays in primary pig-tailed macaque cells. Activated PBLs (a), DC/T cell co-cultures (b), and macrophages (c) were infected with equal doses of SIVmneCl8 and SIVmne027. Total virus was determined by measuring consensus sequence gag RNA transcripts (--). SIVmneCl8 viral RNA levels were measures and are reported as percentages of total viral RNA (····). Three representative experiments (black circle/open circle, black triangle/open triangle, and black square/open square) are shown for each graph and viral RNA values represent the average reading for each time point. Each infection used cells from a different macaque blood donor.