Table 2. COVID-19 outbreak period

Categories Stage 1 Stage 2 (1st Outbreaks) Stage 3 Stage 4 (2nd Outbreaks) Stage 5 (3rd Outbreaks)
Date (2020.1.20-2.17) (2.18-5.5) (5.6-8.11) (8.12-11.12) (11.13-12.31)
Classification Imported cases Large-scale clusters Local clusters, sporadic cases Small and medium-scale clusters many outbreaks A large outbreak nationwide
Confirmed cases n=30 n=10,774 n=3,856 n=13,282 n=45,173
Adapted from Korea Disease Control and Prevention Agency [14] with CC-BY.