41. After several days the oocyst produces ~ 100 sporozoites that leave and migrate to the salivary glands of the fly. 42. Once through the epithelium, the ookinete enters the basil lamina, and forms an oocyst where meiosis takes place. 43. The oocyst is about egg-shaped and has a smooth, single-layered wall about 1 ?m thick. 44. Another problem is that even under a microscope, it is not possible to reliably tell when the oocyst is dead. 45. Upon traversing the midgut wall, the ookinete embeds into the gut's exterior membrane and develops into an oocyst . 46. Over the period of a 1 3 weeks, the oocyst grows to a size of tens to hundreds of micrometres. 47. Within the oocyst the nuclei migrate to the surface of the oocyst and gather cytoplasm around them becoming known as sporoblasts. 48. Within the oocyst the nuclei migrate to the surface of the oocyst and gather cytoplasm around them becoming known as sporoblasts. 49. It has an oocyst residuum and Stieda bodies, structures that are absent in some other " Eimeria ". 50. Although cats can also be infected by ingesting oocysts, they are much less sensitive to oocyst infection than are intermediate hosts.
