Plasmodium knowlesi merozoites were incubated with rhesus monkey erythrocytes at
37oC on the stage of a Zeiss Axiophot fluorescence microscope equipped with Nomarski
optics. Invasion was recorded on a Westinghouse Model ETV 6006E low-light level video
camera and digitized. The parasite is ~1 um long. The captured sequence is played back
in real time.