在其腸中，囊內的子孢子逸出，侵入回腸末端粘膜上皮細胞進行裂體增殖，細胞破裂后裂殖子逸出，侵入附近的細胞，繼續裂體增殖，部分則發育為雌雄配子體，進行配子增殖，形成囊合子，后者落入腸腔，在適宜溫度(℃)和濕度環境中，約經～天發育成熟，抵抗力強，可存活年以上，如被中間宿主吞入，則進入小腸后子孢子穿過腸壁，隨血液或淋巴循環播散全身各組織細胞內以縱二分裂法(endodyogeny)進行增殖，在細胞內可形成多個蟲體的集合體，稱假包囊(pseudocyst)，囊內的個體即滋體或速殖子，為急性期病例的常見形態，宿主細胞破裂后，滋養體散出再侵犯其他組織細胞，如此反復增殖，可致宿主死亡，但更多見的情況是宿主產生免疫力，使原蟲繁殖減慢，其外有囊壁形成，稱包囊，囊內原蟲稱緩殖子，包囊在中間宿主體內可存在數月，數年，甚至終生(呈陷性感染狀態)。孕婦在懷孕期間發生原發性感染（即*次或初次的感染），可以通過胎盤傳染給胎兒，先天性感染是zui重要的一種感染途徑。人和動物的弓形蟲感染廣泛分布于世界各地，英、美調查成人感染率一般約為-%，有的達%，而歐洲大陸和拉丁美洲調查的成人感染率為-%，法國人高達%。而弓形蟲中的剛地弓形蟲，*則有%—%受感染，中國陽性感染率為%—%，部分地區高達%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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