has_participant has participant contact and droplet transmission of SARS-CoV-2 respirtoary droplet transmission of SARS-CoV-2 Oliver He A SARS-CoV-2 transmission that occurs through infected respiratory droplets, which are >5-10 μm in diameter. Respiratory droplet transmission can occur when a person is in close contact (within 1 metre) with an infected person who has respiratory symptoms (e.g. coughing or sneezing) or who is talking or singing; in these circumstances, respiratory droplets that include virus can reach the mouth, nose or eyes of a susceptible person and can result in infection. https://www.who.int/news-room/commentaries/detail/transmission-of-sars-cov-2-implications-for-infection-prevention-precautions infectious droplet