摘要：
We discussed the influence of liquid nitrogen cryopreservation to survive capability of Babesia microti standard strain.The whole blood of mice infected with Babesia microti was put in liquid nitrogen to cryopreservation for 1 month,3 months,6 months,9 months,the whole blood was get out respectively and recovery at room temperature,and infected 3 mice respectively,100 μL/ mouse (the first generation after redissolution,the experiment group).In the same time,3 mice were also infected with Babesia microti as the animal conservation control group.When the infection rate was at a high level,the whole blood of the experiment group mice were injected into 3 normal BALB/c mice (the second generation after redissolution),to observe the changes of the Babesia microti form and proliferation situation,and also to observe the infection rate of the first and the second generation after redissolution in different conserving time.Compared with Babesia microti of animal subcultivation,the form of Babesia microti of liquid nitrogen cryopreservation changed a little.Small trophozoites,annular trophozoites,schizont and immature and mature merozoite and other form can also be seen.Compared with Babesia microti of animal subcultivation,the first time to see the worms and the time attaining to the high infection level were 1 to 2 days later,but for the second generation after redissolution,it is the same.There was no significant difference in different conserving time of 1,3,6,9 months.The influence of liquid nitrogen cryopreservation to survive capability and worm form of Babesia microti is a little,so liquid nitrogen cryopreservation can be a better way to conserving Babesia microti.%目的 探索液氮保种对田鼠巴贝虫标准株存活力的影响.方法 液氮保种1、3、6、9个月的田鼠巴贝虫标准株小鼠血室温复苏后感染正常BALB/c小鼠各3只(复苏1代,实验组),100 μL/只;同时取3只新感染田鼠巴贝虫活体保藏小鼠为对照组.实验组染虫率达高峰时再接种正常BALB/c小鼠(复苏2代),观察田鼠巴贝虫的形态变化及增殖情况,并观察不同保存时间复苏1代及复苏2代的染虫率情况.结果 液氮保种田鼠巴贝虫与活体保种的田鼠巴贝虫相比,形态变化不大,都会出现小滋养体、环状滋养体、裂殖体及未成熟和成熟裂殖子等多种形态.液氮复苏1代首次查见虫体及达到染虫率高峰的时间比动物保种延迟1～2 d,但复苏2代即恢复一致.田鼠巴贝虫染虫全血经液氮保存1、3、6、9个月,仅达到高峰期时间延迟,其存活力未见明显下降.结论 液氮保种对田鼠巴贝虫形态及存活力影响小,可成为一种较好的保存方式.
