Speech droplets generated by asymptomatic carriers of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are increasingly considered to be a likely mode of disease transmission. Highly sensitive laser light scattering observations have revealed that loud speech can emit thousands of oral fluid droplets per second. In a closed, stagnant air environment, they disappear from the window of view with time constants in the range of 8 to 14 min, which corresponds to droplet nuclei of ca. 4 μm diameter, or 12- to 21-μm droplets prior to dehydration. These observations confirm that there is a substantial probability that normal speaking causes airborne virus transmission in confined environments.
All Keywords
【저자키워드】 COVID-19, Respiratory disease, disease transmission, speech droplet, independent action hypothesis, 【초록키워드】 SARS-CoV-2, coronavirus, Asymptomatic carrier, droplet, virus transmission, Probability, speech, observation, acute respiratory syndrome, nuclei, cause, increasingly, scattering, 【제목키워드】 droplet, SARS-CoV-2 transmission,
【저자키워드】 COVID-19, Respiratory disease, disease transmission, speech droplet, independent action hypothesis, 【초록키워드】 SARS-CoV-2, coronavirus, Asymptomatic carrier, droplet, virus transmission, Probability, speech, observation, acute respiratory syndrome, nuclei, cause, increasingly, scattering, 【제목키워드】 droplet, SARS-CoV-2 transmission,