Sequencing and mutations analysis of the first recorded SARS-CoV-2 Omicron variant during the fourth wave of pandemic in Iraq Jivan Qasim Ahmed; Sazan Qader Maulud; Rawand Al-Qadi; Teroj Abdulrahman Mohamed; Gahin Abdulraheem Tayib; Akheenk Mustafa Hassan; Luqman Saleh Taha; Khairi Mohammed Qasim; Mohammed Abid Tawfeeq;

COVID-19 hospitalization in vaccinated and non-vaccinated patients: Clinical profile and outcomes Laura Holtman-Ferreira; Elessandra de Souza Bitencourt; Betina Mendez de Alcantara Gabardo; Susanne Edinger Pereira; Francine Teixeira; Diego da Silva Magatão; Vitor Loureiro Dias; Ricardo Petterle; Meri Bordignon Nogueira; Sonia Mara Raboni;

Demographic, epidemiological and clinical profile of patients with post-COVID syndrome followed at a teaching hospital in Brazil João Paulo Borges de Melo; Alex Eduardo da Silva; Leandro Resende Yamamoto; Taciana Fernandes Araújo Ferreira; Gustavo José Luvizutto; Fernando Freitas Neves; Kelly Cristina Santos; Roger Lopes Batista; Isabel Cunha Santos; Francielle Schiavoni; Mario León Silva-Vergara;