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H ong Kong was relatively successful in mitigating transmission early in the outbreak of coronavirus disease . Confirmed cases were first reported in the city of Wuhan, China, in December 2019 (1). Situated at the southern tip of China, Hong Kong was at risk for importing COVID-19, given its shared border and high infrastructural and social connectivity with China. In 2019, >236 million passengers crossed the border between China and Hong Kong by land (2). Hong Kong is also vulnerable to virus transmission owing to its high population density and heavy reliance on public transportation. Despite these risks, as of March 20, 2020, transmission control efforts in Hong Kong, as reflected in the numbers of confirmed cases and deaths (256 cases, 4 deaths) (3), had been relatively successful compared with nearby countries and regions, including mainland China (80,967 cases, 3,248 deaths), South Korea (8,652 cases, 94 deaths), and Japan (950 cases, 33 deaths, in addition to the 712 cases from a cruise ship) (4).
Kwok et al. (Thu,) studied this question.