Medium-sized cluster events in the first wave were family gatherings, whereas those in the second wave were leisure activities among youngsters. Implementing COVID-19 tests for overseas returners correlated with an upsurge of asymptomatic case detection, and shortened containment delay in the second wave. Aggressive escalation of border control correlated with reductions in R t from 1.35 to 0.57 and 0.92 to 0.18, and aversions of 4 local infections during the first and second waves, respectively. The incidence and mortality (135.5 and 0.5 per 1 000 000 population) was among the lowest in the world. A time series of 5-day moving average was plotted to examine the changes across the two epidemic waves. Factors associated with containment delay were evaluated by multiple linear regression analysis with age, gender, epidemic wave and infection source as covariates. ![]() We retrieved information on the first 1038 cases detected in Hong Kong (23 January to 25 April 2020) to analyse the epidemiological characteristics including age/gender-specific incidence, clustering, reproduction number ( R t ) and containment delay in relation to the containment measures implemented. ![]() ![]() We compared the epidemiological features of patients with COVID-19 in the context of containment policies between the first and second waves. An international city, Hong Kong, in proximity to the first epicentre of COVID- 19, experienced two epidemic waves with different importation pressure.
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