SARS-CoV-2 Superspread in Fitness Center, Hong Kong, China, March 2021

Article Public, Environmental & Occupational Health

Community Transmission of SARS-CoV-2 at Three Fitness Facilities — Hawaii, June–July 2020

Laura M. Groves et al.

MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT (2021)

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Article Public, Environmental & Occupational Health

COVID-19 Outbreak Among Attendees of an Exercise Facility — Chicago, Illinois, August–September 2020

Frances R. Lendacki et al.

MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT (2021)

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Article Construction & Building Technology

Ventilation and air cleaning to limit aerosol particle concentrations in a gym during the COVID-19 pandemic

B. Blocken et al.

Summary: The study found that combining ventilation and air cleaning can effectively reduce indoor aerosol particle concentrations, thereby minimizing the potential risk of airborne virus transmission. The ventilation in the gym was insufficient, and the use of air cleaning alone had limited effectiveness, but combining both methods significantly reduced aerosol concentrations.

BUILDING AND ENVIRONMENT (2021)

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Article Immunology

Assessing Asymptomatic, Presymptomatic, and Symptomatic Transmission Risk of Severe Acute Respiratory Syndrome Coronavirus 2

Peng Wu et al.

Summary: The study found that symptomatic cases are more likely to transmit the virus compared to asymptomatic cases, while asymptomatic and presymptomatic transmissions also play an important role in spreading the infection. Therefore, early case detection and effective test-and-trace measures are crucial in reducing transmission.

CLINICAL INFECTIOUS DISEASES (2021)

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Article Immunology

Introduction of ORF3a-Q57H SARS-CoV-2 Variant Causing Fourth Epidemic Wave of COVID-19, Hong Kong, China

Daniel K. W. Chu et al.

Summary: The article discusses the emergence of a fourth wave of coronavirus disease in Hong Kong caused by clade GH severe acute respiratory syndrome coronavirus 2. This virus carries a ORF3a-Q57H mutation, resulting in truncation of ORF3b, and is able to evade induction of cytokine, chemokine, and interferon-stimulated gene expression in primary human respiratory cells.

EMERGING INFECTIOUS DISEASES (2021)

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Article Medicine, General & Internal