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Categorization of types of COVID-19 clusters with 5 or more cases from January to September 2020 in the Seoul metropolitan area.
| Duration of cluster | |||
|---|---|---|---|
| <2 weeks | ≥2 weeks | ||
| Size of cluster | <30 cases | Type I | Type II |
| 30–99 cases | NA | Type III | |
| ≥100 cases | NA | Type IV |
