What types of environments does covid-19 spread most easily?

The “Three C's” are a useful way to think about this. There have been many similar super-spreading events in the COVID-19 pandemic. A database by Gwenan Knight and colleagues at the London School of Hygiene & Tropical Medicine (LSHTM) lists an outbreak in a dormitory for migrant workers in Singapore linked to nearly 800 cases; 80 infections linked to live music venues in Osaka, Japan; and a group of 65 cases resulting from Zumba classes in Korea from the South. There have also been groupings aboard ships and nursing homes, meatpacking plants, ski resorts, churches, restaurants, hospitals and prisons.

Sometimes a single person infects dozens of people, while other groups develop over several generations of spread, in multiple locations. We know that coronavirus spreads more easily indoors in poorly ventilated spaces.