Increasing SARS-CoV2 cases, hospitalizations and deaths among the vaccinated elderly populations during the Omicron (B.1.1.529) variant surge in UK
BACKGROUND There were increased SARS-CoV2 hospitalizations and deaths noted during Omicron (B.1.1.529) variant surge in UK despite decreased cases, and the reasons are unclear. METHODS In this observational study, we analyzed reported SARS-CoV2 cases, hospitalizations and deaths during the COVID-19 pandemic in the UK. We also analyzed variables that can affect the outcomes. The vaccine effectiveness among those ≥18 years of age (August 16, 2021 to March 27, 2022) was analyzed. RESULTS Of the total cases (n= 22,072,550), hospitalizations (n=848,911) and deaths (n=175,070) due to COVID-19 in UK; 51.3% of cases (n=11,315,793), 28.8% of hospitalizations (n=244,708) and 16.4% of deaths (n=28,659) occurred during Omicron variant surge. When comparing the period of February 28-May 1, 2022 with the prior 12-weeks, we observed a significant increase in the case fatality rate (0.19% vs 0.41%; RR 2.11 [2.06-2.16], p