Mice are infected by mouse hepatitis virus, the rati o is 100%before cesarotomy.After having been cleaned, the mouse hepatitis viru s in closing colony mice has kept negative for 5 year.
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美
- 剖腹产术前100%25感染小鼠肝炎病毒的小鼠种群,经无菌剖腹产术净化后,结果均为阴性,并经5年的大规模生产、繁殖,至今仍保持阴性结果。