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. 2020 Jun;26(6):1343–1345. doi: 10.3201/eid2606.200412

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Cluster of COVID-19 cases associated with a shopping mall in Wenzhou, China. A) Distribution of COVID-19 case-patients by mall floor, time, and internal relationship. B) Dates of symptom onset, confirmed test results, and hospitalization information. Numbers within yellow bars indicate length of incubation period. Black vertical arrow indicates date when patient A returned from Wuhan, China. B1–7, mall floors; C, customer; COVID-19, coronavirus disease; C_t, cycle threshold; T, date of symptom onset; M, month; RT-PCR, reverse transcription PCR.