CD4+ T Cell Counts in Lactating Macaques. CD3+, CD4+ cell counts in peripheral blood of lactating macaques at various time points post-inoculation with SIV. The day of inoculation is represented by the 0 time point. Cell counts for individual monkeys are shown and the means of each transmission group are represented in the line graph. Early transmitters are shown in yellow, late transmitters in red and non-transmitters in blue.