Vaccine effectiveness is lower and wanes faster against infection and symptomatic disease
caused by the omicron variant of SARS-CoV-2 than was observed with previous variants …

The Omicron variant has been associated with reduced vaccine effectiveness (VE) against
mild disease with rapid waning. Meanwhile Omicron has also been associated with milder …

Despite widespread mass rollout programs, the rapid spread of the SARS-CoV-2 Omicron
variant called into question the effectiveness of the existing vaccines against infection …

Emerging in November 2021, the SARS-CoV-2 Omicron variant of concern exhibited
marked immune evasion resulting in reduced vaccine effectiveness against SARS-CoV-2 …

While it is now evident that Omicron is rapidly replacing Delta, due to a combination of
increased transmissibility and immune escape, it is less clear how the severity of Omicron …

Importance The incidence of SARS-CoV-2 infection, including among individuals who have
received 2 doses of COVID-19 vaccine, increased substantially following the emergence of …

Background Estimates of the severity of the SARS-CoV-2 omicron variant (B. 1.1. 529) are
crucial to assess the public health impact associated with its rapid global dissemination. We …

COVID's Omicron variant has sparked a slew of concerns across the globe. This review aims
to provide a brief overview of what we know about the Omicron variant right now. The new …

Importance Few studies have evaluated the waning of vaccine effectiveness against severe
outcomes caused by SARS-CoV-2 Omicron infection. Hong Kong is providing inactivated …

It is critical to determine the real-world performance of vaccines against coronavirus disease
2019 (COVID-19) so that appropriate treatments and policies can be implemented. There …