Abstract
A species of coccidium belonging to the genus Eimeria was isolated from Japanese quails. A pure strain of this species was obtained by the single oocyst infection method. Then the whole life-cycle of this species was clarified by experimental infection. This species was affirmed to be a new one and named Eimeria uzura. E. uzura was mainly located in the duodenum and the upper part of the small intestine. This species resembled E. coturnicis and E. bateri in the morphology of the oocyst except the presence of the micropyle. The sporulation time of E. uzura was 22-24 hrs. at 25°C. The prepatent period was 88-96 hrs. after infection and the patent period was around 13 days. Detailed examination, however, revealed some important differences among these three species. Experimental infection with E. uzura failed in 11 different species of birds which are taxonomically colse to the Japanese quail. Twenty species of Eimeria which attacked the 11 species of birds were never infective to the Japanese quail.
