However, this subject could not be regarded as an élite controller of the infection, because, prior to raltegravir administration, it also showed low CD4 counts (173 CD4+ T cells/μl) which increased to 531 units/μl after 10 days of raltegravir monotherapy, and to 778 units/μl at 52 days of treatment with ART (Fig. 2A). Here, CD4 is linked to infection.