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Transmission

Indoor Air Changes and Potential Implications for SARS-CoV-2 Transmission

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Buildings have been associated with spread of infectious diseases, such as outbreaks of measles, influenza, and Legionella. With SARS-CoV-2, the majority of outbreaks involving 3 or more people have been linked with time spent indoors, and evidence confirms that far-field airborne transmission (defined as within-room but beyond 6 feet) of SARS-CoV-2 is occurring. Controlling concentrations […]

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SARS-CoV-2 transmission dynamics should inform policy

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It is generally agreed that striking a balance between resuming economic and social activities and keeping the effective reproductive number (R0) below 1 using non-pharmaceutical interventions is an important goal until and even after effective vaccines become available. Therefore, the need remains to understand how the virus is transmitted in order to identify high-risk environments and activities that disproportionately

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Assessment of Air Contamination by SARS-CoV-2 in Hospital Settings

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The transmission modes of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) remain controversial. At the emerging stage of the pandemic, many countries implemented high-level precautions, including airborne and contact precautions, to prevent the spread from patients to health care professionals (HCPs). An emerging understanding of SARS-CoV-2 epidemiology, which is primarily transmitted from person to person

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Data and Policy to Guide Opening Schools Safely to Limit the Spread of SARS-CoV-2 Infection

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On March 11, 2020, less than 2 weeks after community transmission of the severe acute respiratory syndrome coronavirus 2 (SARS CoV-2) was identified in the US, the World Health Organization declared that the novel coronavirus (COVID-19) outbreak was a global pandemic. By March 25, 2020, all kindergarten to grade 12 (K-12) public schools in the

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SARS-CoV-2 Transmission From People Without COVID-19 Symptoms

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As severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the novel coronavirus that causes coronavirus disease 2019 (COVID-19), began to spread globally, it became apparent that the virus, unlike the closely related SARS-CoV in the 2003 outbreak, could not be contained by symptom-based screening alone. Asymptomatic and clinically mild infections were uncommon during the 2003 SARS-CoV

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