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Table 1 Some examples of local transmission caused by imported infections in China

From: The governance of imported 2019-nCov infections: What can be learned from China’s experience?

First date of confirmed cases

First location of confirmed cases

Possible causes

11 June 2020

Beijing

By an environment-to-human transmission from contaminated food imported via cold-chain logistics

22 July 2020

Dalian

Clustered outbreak due to exposure at a processing facility of frozen seafood products

24 October 2020

Kashi

Transmission from offshore containers

8 November 2020

Tianjin

Contact with imported frozen pork with positive nucleic acid test (NAT)

9 November 2020

Shanghai

Exposure to an inbound aviation container

7 December 2020

Chengdu

Contact with waste in a quarantine facility of confirmed cases of international travelers

25 December 2020

Beijing

Contact with a confirmed asymptomatic case of international traveler

21 May 2021

Shenzhen

Exposure to international cargo ships

20 July 2021

Nanjing

Exposure to an inbound flight

  1. Data source: The official websites of China’s provincial and municipal health commissions or press conferences on epidemic prevention and control