Division of Veterinary Resources, Office of Research Services, National Institutes of Health, Bethesda, Maryland.
J Am Assoc Lab Anim Sci. 2023 Sep 1;62(5):409-415. doi: 10.30802/AALAS-JAALAS-23-000030. Epub 2023 Sep 27.
Soiled bedding sentinel programs have long been the cornerstone of rodent health monitoring surveillance. Many recent studies have evaluated methods to replace live animals in these programs; however, the type of ventilated rack being used greatly influences the detection rate of adventitious pathogens. This study evaluated 4 alternative sampling techniques across 5 distinct vivaria and assessed their accuracy in detecting 5 pathogens. Testing was done in an operational (real-world) setting using IVC racks that vent air at the cage level. The 5 agents surveyed were mouse norovirus, spp., spp. , and . Samples were collected for subsequent PCR assays as follows: 1) cages with live sentinels exposed to soiled bedding; 2) filter paper placed on the lid of an unoccupied cage containing soiled bedding; 3) filter paper placed in the bedding of an unoccupied cage that contained soiled bedding; 4) swabs from an unoccupied sentinel cage that contained soiled bedding; and 5) pooled swabs from colony cages admixed with swabs from soiled bedding sentinel mice. Cumulative accuracy for all pathogens of interest was highest with the existing soiled bedding sentinel program, followed by pooled swabs of colony cages mixed with swabs from occupied soiled bedding sentinel cages. Soiled bedding sentinel cages detected mouse norovirus, spp., and S. with the highest accuracy; the pooled swabs were best in detecting Rodentibacter spp. and E. . The findings suggest that with the type of rack and caging used in our facilities, the soiled bedding sentinel method has highest concurrence with the expected health status of an animal room, and the results from this method can be enhanced with the addition of pooled swabs of colony animals.
受污染的垫料监测计划一直是啮齿动物健康监测的基石。许多最近的研究评估了在这些计划中替代活体动物的方法;然而,使用的通风架类型极大地影响了偶然病原体的检测率。本研究在 5 个不同的动物房中评估了 4 种替代采样技术,并评估了它们在检测 5 种病原体中的准确性。测试是在使用在笼层通风的 IVC 架的操作(真实世界)环境中进行的。调查的 5 种制剂是鼠诺如病毒、、、。用随后的 PCR 检测收集样本:1)暴露于受污染垫料的带活哨兵的笼子;2)放置在含有受污染垫料的未占用笼子盖上的滤纸;3)放置在含有受污染垫料的未占用笼子中的滤纸;4)含有受污染垫料的未占用哨兵笼子中的拭子;5)与受污染垫料哨兵鼠拭子混合的殖民地笼子混合的拭子。所有感兴趣的病原体的累积准确性以现有的受污染垫料哨兵计划最高,其次是与受污染垫料哨兵鼠混合的殖民地笼子混合的拭子。受污染的垫料哨兵笼子检测到鼠诺如病毒、和 S. 具有最高的准确性;混合有受污染垫料哨兵鼠拭子的殖民地动物混合拭子最适合检测 Rodentibacter spp. 和 E. 。研究结果表明,在我们设施中使用的架和笼类型下,受污染的垫料监测方法与动物房的预期健康状况最一致,并且可以通过添加殖民地动物的混合拭子来增强该方法的结果。