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Mousepox detected in a research facility: case report and failure of mouse antibody production testing to identify Ectromelia virus in contaminated mouse serum

机译:在研究机构中检测到鼠痘:病例报告和未能通过小鼠抗体生产测试来鉴定受污染的小鼠血清中的埃奇霉素病毒

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An outbreak of mousepox in a research institution was caused by Ectromelia-contaminated mouse serum that had been used for bone marrow cell culture and the cells subsequently injected into the footpads of mice. The disease initially was diagnosed by identification of gross and microscopic lesions typical for Ectromelia infection, including foci of necrosis in the liver and spleen and eosinophilic intracytoplasmic inclusion bodies in the skin. The source of infection was determined by PCR analysis to be serum obtained from a commercial vendor. To determine whether viral growth in tissue culture was required to induce viral infection, 36 mice (BALB/cJ, C57BL/6J) were experimentally exposed intraperitoneally, intradermally (footpad), or intranasally to contaminated serum or bone marrow cell cultures using the contaminated serum in the culture medium. Mice were euthanized when clinical signs developed or after 12 wk. Necropsy, PCR of spleen, and serum ELISA were performed on all mice. Mice injected with cell cultures and their cage contacts developed mousepox, antibodies to Ectromelia, and lesions, whereas mice injected with serum without cells did not. Mouse antibody production, a tool commonly used to screen biologic materials for viral contamination, failed to detect active Ectromelia contamination in mouse serum.
机译:研究机构中的鼠痘暴发是由受大肠杆菌污染的小鼠血清引起的,该小鼠血清已用于骨髓细胞培养,随后将细胞注射到小鼠的脚垫中。该病最初是通过鉴定典型的埃特罗克菌感染的肉眼和微观病变来诊断的,包括肝脏和脾脏的坏死灶以及皮肤的嗜酸性胞内包涵体。通过PCR分析确定感染的来源是从商业供应商获得的血清。为了确定是否需要组织培养中的病毒生长来诱导病毒感染,将36只小鼠(BALB / cJ,C57BL / 6J)实验性地腹膜内,皮内(足垫)或鼻内暴露于受污染的血清或使用受污染血清的骨髓细胞培养物中在培养基中。当临床体征出现或12周后对小鼠实施安乐死。对所有小鼠进行尸检,脾脏PCR和血清ELISA。注射了细胞培养物及其笼子接触的小鼠会出现鼠痘,埃奇霉素抗体和损伤,而注射了无细胞血清的小鼠则没有。小鼠抗体的生产是一种通常用于筛选生物材料是否被病毒污染的工具,但未能检测到小鼠血清中的活性埃特罗姆氏菌污染。

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