In this interview Professor Kim Woo-joo describes a similar incident in Korea, where a choir contracted the virus. He adds that 5um is the min for 'droplet' i

In this interview Professor Kim Woo-joo describes a similar incident in Korea, where a choir contracted the virus. He adds that 5um is the min for 'droplet' infection, and that if the droplets remain airborne they can desiccate, and shrink , and then move from 'droplet' to 'aerosol'. https://www.youtube.com/watch?v=gAk7aX5hksU&t=923s https://www.youtube.com/watch?v=gAk7aX5hksU&t=923s