Screen-shots of Giemsa-stained thin-films of malaria-infected murine and human blood scored using the freely available ' Plasmoscore' software. a. A scored image from a C57BL/6 mouse infected with Plasmodium yoelii YM, captured at 1000× magnification. Green arrows indicate unifected RBCs, and red arrows indicate infected RBCs. In this example the user has opted not to discriminate between the different stages of infected RBC. b. A scored image of a human RBC culture experimentally infected with P. falciparum, captured at 600× magnification. In this example the user has chosen to specifically determine the number of trophozoites present (blue arrows), and infected cells at any other stage of development have simply been scored as 'infected RBC' (red arrows).