Abstract
Chick embryos of 10 and 15 days incubation developed severe, invariably fatal infections after intraven. inoculations of erythrocytic stages of P. lophurae. The high proportion of immature definitive erythrocytes present at 10 days offered an ineffective barrier to parasitic invasion, although infections of 15-day embryos resulted in higher parasitemias just prior to death. The infections in each age group were uniform. A preliminary drop of parasite numbers in a few embryos of the first passage was noted, indicating the possibility of adaptation to a new environment.

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