The Life Cycle and Pathogenicity of Eimeria fulva Farr, 1953 in Domestic Goslings

Ya-Bin Dai ； Mei Liu ； Nong-Yue He ； Jian-Ping Tao ； Xing-You Liu

《Acta Protozoologica》 44卷4期 (2005/12) Pp. 311-319

並列摘要

The life cycle and pathogenicity of Eimeria fulva were studied. Eighteen, 10-day-old, artificially-reared coccidia-free goslings (Anser cygnoides var. domestica) were inoculated orally with 7.0×10^5-1.5×10^6 sporulated oocysts of Eimeria fulva and killed at intervals from 24 to 288 h post-inoculation (PI). Parts of the visceral organs including intestines, kidney, liver, gallbladder, and spleen from inoculated goslings were fixed, sectioned, and observed microscopically. The results revealed that at least 2 generations of meronts occurred in the life cycle of E. fulva. The first generation completed maturation at about 72 h PI, and the second at about 144 h PI. Each meront contained about 15 merozoites. Development of gamonts began at about 144 h PI. The prepatent period was 7.5 days and patency continued for 2.5 days. Sporulation of oocysts occurred in 60-84 h at 25°C. Developmental stages were present in the epithelial cells of the villi and crypts, and in the lamina propria of the whole intestine and cloaca, resulting in local desquamation and necrosis of the epithelium (including crypt epithelium), edema, hemorrhages, and infiltration of inflammatory cells. Histological lesions were pronounced in the jejunum and the ileum. The infected goslings mainly showed diarrhoea, slight bloody feces, but no death. The results suggest that E. fulva may be mildly pathogenic for goslings.

並列關鍵字

coccidium ； Eimeria fulva ； gosling ； life cycle ； pathogenicity