from article "Not surprisingly, they found that most clusters originated in gyms, pubs, live music venues, karaoke rooms, and similar establishments where people gather, eat and drink, chat, sing, and work out or dance, rubbing shoulders for relatively extended periods of time. They also concluded that most of the primary cases that touched off large clusters were either asymptomatic or had very mild symptoms."

https://www.sciencemag.org/news/2020/05/japan-ends-its-covid-19-state-emergency?utm_campaign=ScienceNow&utm_source=JHubbard&utm_medium=Facebook - https://www.sciencemag.org/news/2020/05/japan-ends-its-covid-19-state-emergency?utm_campaign=ScienceNow&utm_source=JHubbard&utm_medium=Facebook