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. 2021 Sep 21;75(1):e234–e240. doi: 10.1093/cid/ciab836

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Figure 1. — Number of passengers infected with COVID-19 and close contacts on airlines across mainland China, December 2019 to March 2020. A, Routes and numbers of domestic airlines, excluding flights arriving in Wuhan. B, Number of cases by date of symptom onset. C, Number of cases by date of travel. D, Number of close contacts by date of travel. Black vertical dashed line: the date of Wuhan lockdown on 23 January 2020. Purple vertical dashed line: the Lunar New Year Day on 25 January 2020. Green vertical dashed line: the highest-level (Level 1) public health emergence response implemented across all provinces in mainland China, as of 29 January 2020. Abbreviation: COVID-19, coronavirus disease 2019.