Cross-sectional, analytical and qualitative study that will be carried out with approximately 151 participants who were previously diagnosed with SARS-CoV-2 with mild and severe symptoms of the pathology, diagnosed in primary care in the city of Guarulhos/SP - specifically in the Basic Health Unit Nova Bonsucesso or who have a history of previous admissions - requiring hospitalization in the year 2021 (which will be removed from the COVID case monitoring spreadsheet available at the study UBS). Cells will be collected from the participants' oral cavity using a sterile cotton swab. The collections will be carried out at the Basic Health Unit Nova Bonsucesso, located in the city of Guarulhos/SP (mild/asymptomatic cases), under the supervision and responsibility of the dentist and collaborator of this Leonardo Paroche de Matos project. The Free and Informed Consent Form will be filled out and signed after guidance on the research and its subsequent acceptance by the participant.
