Abstract
A slight active immunity to blood-induced infection with Plasmodium gallinaceum was elicited by immunizing chickens with normal chicken erythrocytes. In ducks immunity to blood-induced infection with P. lophurae was not elicited with erythrocytes from a normal duck, administered intramuscularly with adjuvants (Thomson, Freund, et. al. Amer. Jour. Trop. Med. 27: 79), but marked immunity was elicited by parasitized erythrocytes from the same duck, with adjuvants. Thus it appeared that this method produced a true antiparasitic immunity in ducks.
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