Hilali M
Acta Vet Scand. 1973;14(1):22-43. doi: 10.1186/BF03547408.
Norwegian sheep were investigated for globidial schizont infection in the abomasum. The frequency of infection was found to be 78.2 Light microscope studies of the various mature schizonts revealed the existence of four morphologically different merozoites, small A, small B, intermediate and long forms. Each globidial schizont was found to contain only one form of these merozoites. However, these four schizont types occurred in the same abomasum. The intermediate form of globidial schizont merozoites was investigated by the aid of an electron microscope, with the aim of comparing its internal morphology with that previously published for Eimeria species. A striking resemblance was observed between the fine structures of the intermediate merozoite and that of Eimeria species, particularly the first generation merozoites described in giant schizonts of Eimeria bovis. The present status of globidial schizonts infecting the abomasum of sheep was discussed. It was concluded that these four forms of merozoites could represent different generations of one Eimeria species or different E. species producing giant schizonts in the abomasum. Due to the practical difficulties in studying the life histories of the different Eimeria species infecting sheep, it was proposed that the in vitro propagation of the individual species in cultured cells may shed some light on the corresponding asexual, as well as the sexual, stages. This would offer a new approach to the study of the ultra-structure of the developing parasite.
对挪威绵羊的皱胃进行了球虫裂殖体感染情况的调查。发现感染频率为78.2%。对各种成熟裂殖体的光学显微镜研究显示存在四种形态不同的裂殖子，即小A、小B、中等和长形。发现每个球虫裂殖体仅含有这些裂殖子中的一种形态。然而，这四种裂殖体类型出现在同一个皱胃中。借助电子显微镜对球虫裂殖体裂殖子的中等形态进行了研究，目的是将其内部形态与先前发表的艾美耳属物种的形态进行比较。观察到中等裂殖子的精细结构与艾美耳属物种的精细结构有惊人的相似之处，特别是在牛艾美耳球虫巨型裂殖体中描述的第一代裂殖子。讨论了感染绵羊皱胃的球虫裂殖体的现状。得出的结论是，这四种裂殖子形态可能代表一种艾美耳属物种的不同世代，或者是在皱胃中产生巨型裂殖体的不同艾美耳属物种。由于研究感染绵羊的不同艾美耳属物种的生活史存在实际困难，有人提出在培养细胞中对单个物种进行体外繁殖可能会为相应的无性阶段以及有性阶段提供一些线索。这将为研究发育中寄生虫的超微结构提供一种新方法。
