中文摘要：

目的为探究ToxoDB#17型弓形虫对昆明小鼠的致病特点。方法分别选择〈1个,1个,10^1个,10^2个,10^3个,10^4个,10^5个,10^6个ToxoDB#17型弓形虫卵囊灌胃小鼠,观察小鼠的临床症状,采用改良凝集试验、HE和IHC方法研究弓形虫的感染率,小鼠生存率及其大脑内的包囊数量。结果≥10^4个卵囊组小鼠在攻虫后出现一过性的精神沉郁,弓背,被毛逆立现象,其余组精神状态正常;≥10^2个卵囊可引起小鼠100%感染,感染小鼠的成囊率为2.38%（1/42）,感染小鼠生存率为85.71%（36/42）,存活时间≥360DPI。结论 ToxoDB#17型弓形虫对昆明小鼠的致病力弱,包囊形成率低。

英文摘要：

To investigate the pathogenic characteristic of ToxoDB#17 Toxoplasma gondii in Kunming mice, the mice were fed with 〈1, 1, 10^1, 10^2, 10^3, 10^4, 10^5, 106 oocysts, and the clinical symptoms of mice were observed. MAT, HE and IHC were used to research the infection rate of T. gondii, survival rate of mice and the number of cysts in brain. The results showed that the mice fed with ≥10^4 oocysts appeared transient depression, mice were arched, messy hair after infection. The mice fed with ≥10^2 oocysts were all infected, T. gondii cysts formation rate was 2.38% （1/42）, the survival rate of infected mice was 85.71% （36/42）, the survival time was greater than 360 days. In conclusion, the pathogenicity of ToxoDB#17 T. gondii is weak, and cysts formation rate is also low.