在其肠中，囊内的子孢子逸出，侵入回肠末端粘膜上皮细胞进行裂体增殖，细胞破裂后裂殖子逸出，侵入附近的细胞，继续裂体增殖，部分则发育为雌雄配子体，进行配子增殖，形成囊合子，后者落入肠腔，在适宜温度(℃)和湿度环境中，约经～天发育成熟，抵抗力强，可存活年以上，如被中间宿主吞入，则进入小肠后子孢子穿过肠壁，随血液或淋巴循环播散全身各组织细胞内以纵二分裂法(endodyogeny)进行增殖，在细胞内可形成多个虫体的集合体，称假包囊(pseudocyst)，囊内的个体即滋体或速殖子，为急性期病例的常见形态，宿主细胞破裂后，滋养体散出再侵犯其他组织细胞，如此反复增殖，可致宿主死亡，但更多见的情况是宿主产生免疫力，使原虫繁殖减慢，其外有囊壁形成，称包囊，囊内原虫称缓殖子，包囊在中间宿主体内可存在数月，数年，甚至终生(呈陷性感染状态)。孕妇在怀孕期间发生原发性感染（即*次或初次的感染），可以通过胎盘传染给胎儿，先天性感染是zui重要的一种感染途径。人和动物的弓形虫感染广泛分布于世界各地，英、美调查成人感染率一般约为-%，有的达%，而欧洲大陆和拉丁美洲调查的成人感染率为-%，法国人高达%。而弓形虫中的刚地弓形虫，*则有%—%受感染，中国阳性感染率为%—%，部分地区高达%以上。
In its intestine, the sporozoites within the capsule escape and invade the mucosal epithelial cells of the terminal ileum and undergo fission. The merozoites escape after cell rupture and invade the nearby cells and continue to proliferate. Some develop into male and female gametophytes. The gametocytes proliferate to form cystic zygote, which falls into the lumen of the intestine. At the appropriate temperature (°C) and humidity environment, it matures after about ~10 days. It has strong resistance and can survive for more than a year. If it is swallowed by an intermediate host, then After entering the small intestine, the sporozoites pass through the intestine wall, and the cells of the tissues of the body are dispersed with the blood or lymph circulation and proliferated in an endodyogeny. A plurality of aggregates of the worm body can be formed in the cells, and the pseudo-cysts are called (pseudocyst), the individual in the capsule is the trophozoite or tachyzoite, which is a common form of acute cases. After the host cell ruptures, the trophozoites are dispersed and then invade other tissue cells. Such repeated proliferation can cause the death of the host, but more More often than not, the host produces immunity, which slows the reproduction of the protozoa and forms a cyst wall outside. The cysts are called cysts. Protozoa within the cyst are called bradyzoites. The cysts can exist in the intermediate host for months, years, or even Lifetime (was trapped infection status). Pregnant women develop a primary infection (ie, the first or first infection) during pregnancy and can be transmitted to the fetus through the placenta. Congenital infection is the most important route of infection. Toxoplasma gondii infections in humans and animals are widely distributed around the world. The adult infection rates in the UK and the United States are generally around -% and some are up to %. The European adults and Latin Americans surveyed had an adult infection rate of -% and French people up to %. . Toxoplasma gondii in Toxoplasma gondii has 5% infection in the whole world. The positive infection rate in China is %-%, and up to % in some regions.s.

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