@article{Nyberg_T-2023_150360,
title = {A standardised protocol for relative SARS-CoV-2 variant severity assessment, applied to Omicron BA.1 and Delta in six European countries, October 2021 to February 2022},
author = {Nyberg, T. and Bager, P. and Svalgaard, I. and Bejko, D. and Bundle, N. and Evans, J. and Krause, T. and McMenamin, J. and Mossong, J. and Mutch, H. and Omokayne, A. and Peralta-Santos, A. and Pinto-Leite, P. and Starrfelt, J. and Thelwall, S. and Veneti, L. and Whittaker, R. and Wood, J. and Pebody, R. and Presanis, A.},
month = {sep},
year = {2023},
abstract = {During the COVID-19 pandemic, several variants of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) evolved. These had different risks of causing severe disease [1-18], possibly due to differences in symptom profile [19-22], viral load [23,24], vaccine effectiveness [3,5,22,25,26] or via other mechanisms. A wide range of estimates of the relative risks of severe outcomes such as hospitalisation and death associated with new variants have been reported, often with moderate precision. Some countries have published variant severity assessments based on national data, but many countries have not. Thus, there are likely observational data available on COVID-19 cases and their outcomes which could further inform about variant severity, if analysed within a valid study design and statistical analysis framework to minimise potential biases.},
volume = {28},
issue = {36},
journal = {Eurosurveillance},
publisher = {European Centre for Disease Prevention and Control},
url = {https://doi.org/10.2807/1560-7917.ES.2023.28.36.2300048},
}
