@article{moraes_raposo_2025,  title={Impact of vaccination and SARS-CoV-2 variants on severe COVID-19 outcomes: a cross-sectional study, Brazil, 2021-2022},  volume={34},  ISSN={2237-9622},  url={https://doi.org/10.1590/S2237-96222025v34e20240613.en},  DOI={10.1590/S2237-96222025v34e20240613.en},  journal={Epidemiologia e Serviços de Saúde},  publisher={Secretaria de Vigilância em Saúde e Ambiente - Ministério da Saúde do Brasil},  author={Moraes, Luiza Paiva and Raposo, Letícia Martins},  year={2025},  pages={e20240613} }