Plasmodium japonicum，A New Species of Malaria Parasite Pathogenic for the Domestic Fowl

In the course of studies of fowl leucosis by the author in January 1955, a newstrain of anemia (erythroblastosis)was isolated from a leucemia like-disease of fowl.This was seperated from both erythroleucosis and myeloid leucosis. Since its discovery up to date this disease has been successfully transmitted through 28 serial passages by baby chicks.Then in his laboratory, following the studies of this disease, a second anemic fowl has been under his observation. Blood from each available bird was injected into days old chicks and at the same time blood smears were examined with a microscope for the presence of pathological changesof blood cells. ln November 1955, a plasmodium was observed in the blood of a youngchicken in Chofu-machi.lt was proved transmissible to very young ckickens. Since its discovery by the author, this parasite has been maintained in various breeds of domestic fowl for a period of over 4 months and to date it has been suc-cessfully carried through serial passages. ・・・

Plasmodium　japonicum

家鶏

病原性

マラリア寄生原虫