inclusion criteria: - willing and able to provide written informed consent, or with a legal representative who can provide informed consent - aged ≥ 21 years (at all sites) - subjects that have been vaccinated with the first dose of a vaccine (any brand approved in bahrain is permitted) to protect against covid-19 infection

inclusion criteria: - willing and able to provide written informed consent, or with a legal representative who can provide informed consent - aged ≥ 21 years (at all sites) - subjects that have been vaccinated with the first dose of a vaccine (any brand approved in bahrain is permitted) to protect against covid-19 infection