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Quantification and Whole Genome Characterization of SARS-CoV-2 RNA in Wastewater and Air Samples
Published on: June 30, 2023
Indoor transmission of SARS-CoV-2
1School of Energy and Environment, Southeast University, Nanjing, China.
Abstract:
It is essential to understand where and how severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is transmitted. Case reports were extracted from the local Municipal Health Commissions of 320 prefectural municipalities in China (not including Hubei Province). We identified all outbreaks involving three or more cases and reviewed the major characteristics of the enclosed spaces in which the outbreaks were reported and their associated indoor environmental aspects. Three hundred and eighteen outbreaks with three or more cases were identified, comprising a total of 1245 confirmed cases in 120 prefectural cities. Among the identified outbreaks, 53.8% involved three cases, 26.4% involved four cases, and only 1.6% involved ten or more cases. Home-based outbreaks were the dominant category (254 of 318 outbreaks; 79.9%), followed by transport-based outbreaks (108; 34.0%), and many outbreaks occurred in more than one category of venue. All identified outbreaks of three or more cases occurred in indoor environments, which confirm that sharing indoor spaces with one or more infected persons is a major SARS-CoV-2 infection risk.
Insights
Understanding severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmission is key. This study found most SARS-CoV-2 outbreaks occurred indoors, primarily in homes, highlighting indoor spaces as major infection risks.
Area of Science:
- Epidemiology
- Infectious Diseases
- Public Health
Background:
- Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmission patterns require detailed investigation.
- Understanding transmission dynamics is crucial for effective public health interventions.
Purpose of the Study:
- To identify and characterize SARS-CoV-2 outbreaks in indoor environments in China.
- To determine the primary settings and characteristics of SARS-CoV-2 transmission events.
Main Methods:
- Extracted case reports from local health commissions across 320 prefectural municipalities in China (excluding Hubei Province).
- Identified outbreaks involving three or more confirmed cases.
- Reviewed characteristics of enclosed spaces and indoor environmental factors associated with reported outbreaks.
Main Results:
- Identified 318 outbreaks with 1245 confirmed cases across 120 cities.
- Home-based outbreaks constituted the majority (79.9%), followed by transport-based outbreaks (34.0%).
- All identified outbreaks occurred in indoor environments, confirming indoor transmission risk.
Conclusions:
- Indoor environments, particularly homes, are significant settings for SARS-CoV-2 transmission.
- Sharing indoor spaces with infected individuals poses a substantial risk for SARS-CoV-2 infection.
- Findings underscore the importance of ventilation and infection control measures in indoor settings.
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