Table 2.
shows examples [36, 37, 38, 39, 40, 41] of evident COVID‐19 superspreader events, meaning that they occurred in a limited time period so that it most likely represents multiple secondary infection from a single superspreader
| Location | Event type and comments | Date (duration) | Estimated number of secondary infections from one superspreader | Participants | Attack rate |
|---|---|---|---|---|---|
| Skagit County, USA | Choir practice with social distancing transmission 1 | March 10 (2.5 h) | 52 | 61 | 87% |
| Calgary, Australia | Service and party in a church with social distancing 1 | Mid‐March (a few hours) | 23 | 41 | 59% |
| Guangzhou, China | Restaurant, asymptomatic superspreader 2 | January 24 (one lunch period) | 9 | 91 | 11% |
| Edmonton, Canada | Bonspiel (curling event) | March 11–14 (4 days) | 23 2 | 72 3 | 33% |
| Chicago, USA | A dinner, a funeral, and a birthday party | February‐March (three distinct events) | 10 | – | – |
| Zhejiang province, China | Bus ride and worship event (WE) 1 |
Bus ride: 100 mins WE: 150 mins |
Bus 1: 0 Bus 2: 23 WE, others: 7 WE, total: 30 |
Bus 1: 60 Bus 2: 68 WE, others: 172 WE, total: 300 |
Bus 1: 0 % Bus 2: 35% WE, others: 4% WE, total: 10% |
A long list of 1400 outbreaks is available in the following database: https://docs.google.com/spreadsheets/d/1c9jwMyT1lw2P0d6SDTno6nHLGMtpheO9xJyGHgdBoco/edit
1
Highly probable case of aerosolized transmission.
2
High probability of at least some tertiary infections.
3
“Roughly 72 attendees”.