THE ERYTHROCYTIC SCHIZOGONY OF 2 SYNCHRONIZED STRAINS OF PLASMODIUM-BERGHEI, NK65 AND ANKA, IN NORMOCYTES AND RETICULOCYTES

By a modified Percoll-glucose centrifugation technique the rings and y oung trophozoites of two strains of Plasmodium berghei, NK65 and ANKA, were separated from the other erythrocytic stages and inoculated into mice. The subsequent infection was followed for ANKA in normal mice a nd for NK65 in normal mice and in mice with high-grade reticulocytosis induced by injections of phenylhydrazine. The duration of the erythro cytic schizogony of the NK65 strain was shown to be independent of the age of the host cell, and the hour of inoculation did not influence t he cycle of the ANKA strain.