The local (COVID-19) transmission chain (in Hong Kong) has begun (as of 6 February 2020), and if we do nothing to control it, Hong Kong will become another mainland city that has suffered lots of cases.
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Yuen Kwok-yung (2020) cited in "Coronavirus: community outbreak declared in Hong Kong as government prepares to quarantine mainland Chinese entering city in hotels and facilities" on South China Morning Post, 6 February 2020.