Our research aimed to review the potential risk of infection by SARS-CoV-2. We used an excerpt of a data set generated in May 2020 for reviewing the SARS-CoV-2 prevention concept of orchestras, singers and actors. People were sampled for droplet release for one-hour activities using a Grimm spectrometer covering a spectrum of 1 to 32 µm diameter. We estimated the number of “quanta” in the exhaled liquid from viral concentrations of 10 6 to 10 11 /mL, based on the Human Infective Dose 50 of 218 viral particles. We employed the Wells–Riley equation to estimate the risk of infection in typical meeting rooms for a one-hour meeting of 2, 4 and 6 people observing a 2 m distance. The four participating adults released a mean of 1.28 nLm 3 while breathing, 1.68 nL/m 3 while speaking normally, and two adults released a mean of 4.44 nL/m 3 while talking with a raised voice. The combination of 50% breathing, 45% talking normally and 5% speaking with a raised voice increased the risk of infection above 5% for a one-hour meeting of two people. The result is based on 6 quanta released, corresponding to an initial virus concentration of 1000/nL (10 9 /mL) in the fluid of the upper respiratory tract. Our data confirm the importance of using facemasks in combination with other measures to prevent transmission of SARS-CoV-2 at the workplace.
【저자키워드】 COVID-19, SARS-CoV-2, aerosol transmission, breathing, speaking, asymptomatic spreader, meetings, 【초록키워드】 Human, Infection, facemasks, breathing, virus, activity, Workplace, Viral, Research, facemask, respiratory, Spectrum, upper respiratory tract, Infective dose, Combination, Concentration, Viral particles, risk of infection, data set, Viral concentration, potential risk, measure, quanta, viral concentrations, transmission of SARS-CoV-2, Prevent, initial, raised, released, increased the risk, the SARS-CoV-2, 【제목키워드】 Release, aerosol,