CD4 and HIV infectious disease: CSF tau correlated with ptau (rho 0.479, p < 0.0005), but not with BA42, and with current CD4+ T-cells count (rho −0.352, p = 0.003), CSF HIV-RNA (rho 0.348, p = 0.003), neopterin (rho 0.369, p = 0.009), length of HIV infection (rho 0.309, p = 0.009), and length of viral suppression (rho −0.457, p = 0.022).