Covid-19 Vaccine Effectiveness against the Omicron (B.1.1.529) Variant.

Background: A rapid increase in coronavirus disease 2019 (Covid-19) cases due to the omicron (B.1.1.

Characteristics associated with COVID-19 vaccine uptake among adults aged 50 years and above in England (8 December 2020-17 May 2021): a population-level observational study.

Objective: To determine characteristics associated with COVID-19 vaccine coverage among individuals aged 50 years and above in England since the beginning of the programme.

Design: Observational cross-sectional study assessed by logistic regression and mean prevalence margins.

Setting: COVID-19 vaccinations delivered in England from 8 December 2020 to 17 May 2021.