Cross sectional with longitudinal component~Stimulated whole mouth fluid (SWMF) and blood samples from South Asian and non-Asian populations~Controls, and COVID-19 patients in both populations.~Oral disease questionnaire and clinical examination~Separation of SWMF into pellet for DNA extraction for microbiomics and supernatant for cell phenotype analysis, cytokines and antibodies to SARS-CoV2 antigens
Determining whether in the mouth there are differences between the participant groups in the nature and activity of mucosal innate immunity, in immune responses to SARS-COV2 antigens, or in the oral microbiome