One Year Weekly Size-Resolved Air Sampling of SARS-CoV-2 in Hospital Corridors and Relations to the Indoor Environment

IF 4.3 2区 环境科学与生态学 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Indoor air Pub Date : 2024-03-27 DOI:10.1155/2024/5578611
Sara Thuresson, Carl-Johan Fraenkel, Sviataslau Sasinovich, Patrik Medstrand, Malin Alsved, Jakob Löndahl
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Abstract

Background. Airborne SARS-CoV-2 plays a prominent role in COVID-19 transmission. Numerous studies have sampled air from patient rooms, but airborne spread to other hospital areas such as corridors is less investigated. Methods. Size-fractionated aerosol particles were collected weekly, with 12 hours of sampling time daily, in corridors at two infectious disease wards in southern Sweden between March 2020 and May 2021. Samples were analysed with real-time reverse transcription polymerase chain reaction (RT-qPCR) for detection of SARS-CoV-2 RNA. Indoor temperature, relative humidity, and CO2 concentration were monitored during the sampling period. Results. 20 of the 784 collected samples contained SARS-CoV-2 RNA, although in low concentrations. Positive air samples were found in sizes between 0.14 and 8.1 μm, but none >8.1 μm. 45% were found in submicron particles. No clear seasonal pattern was observed among the positive samples. There was no significant difference in the positivity rate of the samples between the two wards. Conclusions. SARS-CoV-2 was only detected in 2.6% of the aerosol samples, which indicates that the spread of airborne virus from patient rooms to the corridor was limited.

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医院走廊中 SARS-CoV-2 的一年期每周粒度分辨空气采样及其与室内环境的关系
背景。空气传播的 SARS-CoV-2 在 COVID-19 传播中扮演着重要角色。许多研究都对病房的空气进行了采样,但对空气传播到医院其他区域(如走廊)的情况调查较少。研究方法在 2020 年 3 月至 2021 年 5 月期间,每周在瑞典南部两家传染病病房的走廊收集大小分馏气溶胶颗粒,每天采样 12 小时。采用实时反转录聚合酶链反应(RT-qPCR)对样本进行分析,以检测 SARS-CoV-2 RNA。采样期间对室内温度、相对湿度和二氧化碳浓度进行了监测。结果在采集的 784 个样本中,有 20 个样本含有 SARS-CoV-2 RNA,但浓度较低。阳性空气样本的大小在 0.14 至 8.1 微米之间,但没有大于 8.1 微米的样本。亚微米颗粒占 45%。阳性样本没有明显的季节性。两个病房的样本阳性率没有明显差异。结论只有 2.6% 的气溶胶样本检测到 SARS-CoV-2 病毒,这表明病毒从病房传播到走廊的范围有限。
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来源期刊
Indoor air
Indoor air 环境科学-工程:环境
CiteScore
10.80
自引率
10.30%
发文量
175
审稿时长
3 months
期刊介绍: The quality of the environment within buildings is a topic of major importance for public health. Indoor Air provides a location for reporting original research results in the broad area defined by the indoor environment of non-industrial buildings. An international journal with multidisciplinary content, Indoor Air publishes papers reflecting the broad categories of interest in this field: health effects; thermal comfort; monitoring and modelling; source characterization; ventilation and other environmental control techniques. The research results present the basic information to allow designers, building owners, and operators to provide a healthy and comfortable environment for building occupants, as well as giving medical practitioners information on how to deal with illnesses related to the indoor environment.
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