DC frequencies are strongly associated with plasma viral load. Correlation of plasma viral load (A-B) and CD4 counts (C-D) to mDC and pDC frequencies from primary HIV-infected subjects at Fiebig stages I-II (N = 11) (A,C) and III-VI (N = 30) (B,D). III-IV (N = 3) and V-VI (N = 27) were combined as III-IV contained too few N for statistical analysis. Associations between various parameters were evaluated using linear regression. Open diamonds correspond to mDCs and closed circles correspond to pDCs. Solid lines denote the relationship between mDC numbers and plasma viral load or CD4 counts. Dotted lines denote the relationship between pDC numbers and plasma viral load or CD4 counts. p denotes the P value of the slope parameter in the linear regression.