A fast-spreading SARS-CoV-2 variant identified in the United Kingdom in December 2020 has raised international alarm. We estimate that, in 16 out of 1...Read more

為了控制COVID-19的傳播，香港需要實施社區檢測計劃，以識別和防止隱性傳播。許多國家和地區已經採用這樣的檢測計劃，在短時間內對社區成員進行廣泛檢測。香港政府已經實施了多項社交距離措施和監測系統，以篩查感染者和追蹤密切接觸者，但由於無症狀病例，病毒仍在社區中傳播。政府在2020年9月進行了為期兩周...Read more

Non-pharmaceutical interventions (NPIs) remain the only widely available tool for controlling the ongoing SARS-CoV-2 pandemic. We estimated weekly val...Read more

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

During the coronavirus disease pandemic, international travel controls have been widely adopted. To determine the effectiveness of these measures, we ...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

A fast-spreading severe acute respiratory syndrome coronavirus 2 variant identified in the United Kingdom in December 2020 has raised international al...Read more

Many public health responses and modeled scenarios for COVID-19 outbreaks caused by SARS-CoV-2 assume that infection results in an immune response tha...Read more

The methods to ascertain cases of an emerging infectious disease are typically biased toward cases with more severe disease, which can bias the averag...Read more

There is limited evidence on vaccine effectiveness against asymptomatic or mild Omicron infections. We estimated that recent third doses of messenger ...Read more

Understanding the public’s attitude towards COVID-19 vaccination and their acceptance could help facilitate the COVID-19 rollout. This study aimed to ...Read more

Background: Many countries/regions implemented strict border measures (e.g., 14-day quarantines) as a blanket policy to prevent COVID-19 importations,...Read more

Background: Disparities were marked in previous pandemics, usually with higher attack rates reported for those in lower socioeconomic positions and fo...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

Hong Kong has implemented stringent public health and social measures (PHSMs) to curb each of the four COVID-19 epidemic waves since January 2020. The...Read more

Background: Dose fractionation of a coronavirus disease 2019 (COVID-19) vaccine could effectively accelerate global vaccine coverage, while supporting...Read more

Comparison of coronavirus disease 2019 (COVID-19) case numbers over time and between locations is complicated by limits to virological testing to conf...Read more