Abd-Allah Shazly Mohammed
Department of Zoology, Faculty of Science, Cairo University, Egypt.
J Egypt Soc Parasitol. 2003 Aug;33(2):497-516.
The prevalence and levels of parasitaemia of haemogregarine infection among Arabian ranid frogs, Rana ridibunda, in Saudi Arabia was studied for the first time. Erythrocytic and merogonic stages of Hepatozoon ridibundae sp. nov. in the intermediate vertebrate host, R. ridibunda were described by light microscopy. The erythrocytic parasites were differentiated into small form (trophozoite) measuring 14.6 +/- 0.3 x 3.8 +/- 0.4 microm and the mature form (gamont) which was banana-shaped with hooked anterior end and blunt broad posterior end and measuring 19.8 +/- 1.8 x 5.2 +/- 0.6 microm. The gamonts of the present parasite induced nuclear fragmentation or segmentation in host erythrocytes. Merogony, of the ectomerogonic type, took place in the liver parenchyma cells. Two meront types were observed. Small meronts (micromeronts) yielded 2-6 (average 4) large merozoites (macromerozoites) measuring 16.6 +/- 0.6 x 6.2 +/- 0.5 microm in size. Large meronts (macromeronts) yielded 18-30 (average 24) elongated merozoites (micromerozoites) measuring 15.2 +/- 0.3 x 3.8 +/- 0.4 microm. A partial systematic revision of the haemogregarine complex was discussed in the view of the diagnostic characteristic features of the 6 recognized haemogregarine genera.
首次对沙特阿拉伯的阿拉伯林蛙（泽蛙）血簇虫感染的流行情况和血症水平进行了研究。通过光学显微镜描述了中间脊椎动物宿主泽蛙体内新种里氏肝簇虫的红细胞期和裂殖生殖期。红细胞内的寄生虫可分为小型形态（滋养体），大小为14.6±0.3×3.8±0.4微米，以及成熟形态（配子体），呈香蕉形，前端有钩，后端钝圆且宽阔，大小为19.8±1.8×5.2±0.6微米。当前寄生虫的配子体可诱导宿主红细胞发生核碎裂或核分裂。外质裂殖生殖发生在肝实质细胞中。观察到两种裂殖体类型。小型裂殖体（小裂殖体）产生2 - 6个（平均4个）大型裂殖子（大裂殖子），大小为16.6±0.6×6.2±0.5微米。大型裂殖体（大裂殖体）产生18 - 30个（平均24个）细长的裂殖子（小裂殖子），大小为15.2±0.3×3.8±0.4微米。基于6个已确认的血簇虫属的诊断特征，对血簇虫复合体进行了部分系统修订。
