Many locations around the world have used real-time estimates of the time-varying effective reproductive number (Rt) of COVID-19 to provide evidence o...Read more

The existing surveillance approaches and contact tracing identified around three quarters of coronavirus disease 2019 (COVID-19) cases during the thir...Read more

Background: The relative contributions of asymptomatic, pre-symptomatic and symptomatic transmission of SARS-CoV-2 have not been clearly measured alth...Read more

Background: Hong Kong maintained low circulation of SARS-CoV-2 until a major community epidemic of the omicron (B.1.1.529) sublineage BA.2 began in Ja...Read more

Background: On-arrival quarantine has been one of the primary measures to prevent the introduction of SARS-CoV-2 into Hong Kong since the start of the...Read more

Background: When a new infectious disease emerges, appropriate case definitions are important for clinical diagnosis and for public health surveillanc...Read more