SYBR Green fluorescence intensity as a measure of parasite density. The SYBR Green fluorescence of parasitized blood at 5% or 2.5% haematocrit was measured at serial 2- fold dilutions in a 96 well micro titre plate assay. The correlation between parasite density and fluorescence intensity was determined. Controls included non-infected blood at 5% haematocrit, RPMI 1640 medium without Albumax and complete RMPI medium with Albumax. Error bars represent the standard error of two replicate experiments.