Abstract
A method is described for the visualization of red blood cells infected with Plasmodium falciparum ingested by monocytes or polymorphonuclear leukocytes (PMN) after in vitro incubation. Smears were stained with peroxidase followed by 4,6-diamino-2-phenylindole (DAPI) staining specific for DNA. Monocytes or PMN were identified under normal illumination by the peroxidase stain and the nuclei of these cells as well as the parasites were identified by means of the DAPI stain with ultraviolet light. Using this method we found that monocytes and PMN from normal blood donors preferentially phagocytose plasmodium falciparum infected red blood cells in the presence of sera from subjects living in areas endemic for malaria.
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