A study conducted by Imperial College of London analyzed all PCR confirmed cases of SARS-CoV2 in England and compared Omicron with Delta (and other variants) using logistic and Poisson regression analysis methods to explore various predictors such as gender, ethnicity, status of symptoms, vaccine status, age, and region. Results showed that asymptomatic status and hospitalization indicators are not significantly associated with omicron, indicating that it is not less severe or milder than Delta or other variants. Additionally, vaccine efficacy is substantially reduced in the traditional 2 dose schedule and, to some degree if the 1/2 dose booster is included. Furthermore, reinfection is 5 times more likely with Omicron compared to the Delta variant, and the Omicron variant grows at a faster and in an exponential rate compared to previous variants.
Read the report here.