Abstract
Intra-erythrocytic Plasmodium species can be stained with the DNA binding dye, Hoechst 33342, and the distribution of DNA content determined for parasite populations by flow cytometric measurement of fluorescence. Analysis of this distribution will determine the parasitaemia (percentage of erythrocytes infected), and the percentages of trophozoite infected red blood cells, polyparasitized (trophozoite) red blood cells, and schizont/segmenter infected red blood cells. This analysis is based on the hypothesis that the asexual parasites cycle with single G1 period, and effectively, a single S phase with no significant G2/M period except at schizogony when the genome DNA content is equivalent to 8 N or higher, dependent on the species. Data are presented to support this model.
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