Productively infected (double-positive, DP) and latently infected (single mCherry-positive, mC) CD4+ T cells were clearly distinguishable (Figure 1B), and the percentage of the DP cells was roughly 16 times more than the single mC-positive cells on day 3 post-infection (p.i.)in STCM (Super T cell medium) (Figure 1B). The gene discussed is CD4; the disease is infection.