An outbreak of COVID-19 caused by the SARS-CoV-2 Omicron BA. 2 sublineage occurred
in Shanghai, China from February 26 to June 30, 2022. We use official reported data …

Omicron and its sublineages are currently predominant and have triggered epidemiological
waves of SARS-CoV-2 around the world due to their high transmissibility and strong immune …

Background Understanding severity of infections with severe acute respiratory syndrome
coronavirus 2 (SARS-CoV-2) and its variants is crucial to inform public health measures …

Importance In 2022, Omicron variants circulated globally, and Urumqi, China, experienced a
COVID-19 outbreak seeded by Omicron BA. 5 variants, resulting in the highest number of …

Dear Editor, SARS-CoV-2 Omicron variant BA. 1 first emerged on the Chinese mainland on
January 8, 2022, in Tianjin and caused a large wave of infections. 1 Four rounds of mass …

Monitoring population protective immunity against SARS-CoV-2 variants is critical for risk
assessment. We hypothesize that Hong Kong's explosive Omicron BA. 2 outbreak in early …

Our analysis of data collected from multiple epidemics in Hong Kong indicated a shorter
serial interval and generation time of infections with the SARS-CoV-2 Omicron variant. The …

The sudden change of public health policy in containing COVID-19 in China around 7
December 2022 and the subsequent immediate large-scale outbreak of severe acute …

Summary Background The Omicron wave of COVID-19 in England peaked in January 2022
resulting from the rapid transmission of the Omicron BA. 1 variant. We investigate the spread …

Background Assessment of viral kinetics of SARS-CoV-2 can inform on host immune
responses to the virus and on the viral transmission potential. We aimed to characterise viral …