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采用新型采样技术对多种雾化器类型产生的 SARS-CoV-2 气溶胶的粒径和存活能力进行表征。

Characterisation of Particle Size and Viability of SARS-CoV-2 Aerosols from a Range of Nebuliser Types Using a Novel Sampling Technique.

机构信息

UK Health Security Agency (UKHSA), Porton Down, Salisbury SP4 0JG, UK.

出版信息

Viruses. 2022 Mar 19;14(3):639. doi: 10.3390/v14030639.

Abstract

Little is understood about the impact of nebulisation on the viability of SARS-CoV-2. In this study, a range of nebulisers with differing methods of aerosol generation were evaluated to determine SARS-CoV-2 viability following aerosolization. The aerosol particle size distribution was assessed using an aerosol particle sizer (APS) and SARS-CoV-2 viability was determined after collection into liquid media using All-Glass Impingers (AGI). Viable particles of SARS-CoV-2 were further characterised using the Collison 6-jet nebuliser in conjunction with novel sample techniques in an Andersen size-fractioning sampler to predict lung deposition profiles. Results demonstrate that all the tested nebulisers can generate stable, polydisperse aerosols (Geometric standard deviation (GSD) circa 1.8) in the respirable range (1.2 to 2.2 µm). Viable fractions (VF, units PFU/particle, the virus viability as a function of total particles produced) were circa 5 × 10. VF and spray factors were not significantly affected by relative humidity, within this system where aerosols were in the spray tube an extremely short time. The novel Andersen sample collection methods successfully captured viable virus particles across all sizes; with most particle sizes below 3.3 µm. Particle sizes, in MMAD (Mass Median Aerodynamic Diameters), were calculated from linear regression of log-log transformed cumulative PFU data, and calculated MMADs accorded well with APS measurements and did not differ across collection method types. These data will be vital in informing animal aerosol challenge models, and infection prevention and control policies.

摘要

人们对雾化对 SARS-CoV-2 存活能力的影响知之甚少。在这项研究中,评估了一系列具有不同气溶胶生成方法的雾化器,以确定气溶胶化后 SARS-CoV-2 的存活能力。使用气溶胶粒度分析仪(APS)评估气溶胶颗粒的大小分布,并使用全玻璃撞击器(AGI)将气溶胶收集到液体介质中后确定 SARS-CoV-2 的存活能力。使用 Collison 6-jet 雾化器结合安德森尺寸分级采样器中的新型样品技术,进一步对 SARS-CoV-2 的存活颗粒进行了特征描述,以预测肺部沉积分布。结果表明,所有测试的雾化器都可以在可吸入范围内(1.2 至 2.2 µm)产生稳定的多分散气溶胶(几何标准偏差(GSD)约为 1.8)。存活分数(VF,单位 PFU/颗粒,病毒的存活能力与产生的总颗粒数有关)约为 5×10。VF 和喷雾因子不受相对湿度的显著影响,在这个系统中,气溶胶在喷雾管中停留的时间极短。新型安德森样品采集方法成功地捕获了所有大小的存活病毒颗粒;大多数粒径小于 3.3 µm。通过对对数转换的累积 PFU 数据进行线性回归计算 MMAD(质量中值空气动力学直径),并与 APS 测量值相符,且不同收集方法类型之间没有差异。这些数据对于告知动物气溶胶挑战模型以及感染预防和控制政策至关重要。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7908/8950415/e59e89a9d602/viruses-14-00639-g001.jpg

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