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. 2020 Apr 10;69(14):411–415. doi: 10.15585/mmwr.mm6914e1

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The figure is a box graph illustrating seven COVID-19 clusters with evidence of likely presymptomatic SARS-CoV-2 transmission from source patients to secondary patients, by exposure, symptom onset date, and likely transmission period, in Singapore during January 19–March 12, 2020. — Seven COVID-19 clusters with evidence of likely presymptomatic SARS-CoV-2 transmission from source patients to secondary patients — Singapore, January 19–March 12, 2020