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Epidemic curves of coronavirus disease 2019 (COVID-19) in Hunan Province and its 3 subregions related to this study. Cases were classified as imported symptomatic cases, imported asymptomatic cases, locally infected symptomatic cases, and locally infected asymptomatic cases. Epidemic curves of COVID-19 are shown for (A) Hunan Province; (B) the city where Place I is located; (C) the city where Place II is located; and (D) the county where Place III is located.
