• People aged 50 years and over who have tested positive for SARS-CoV-2 (by any NAAT/PCR based testing system recognised by public health authorities) within the preceding 12 days • Are still symptomatic or have not yet developed symptoms • Have any of the following risk factors: take medication for high blood pressure, take medication (oral or injectable) for blood glucose control, take medication for heart disease, take medication (oral or inhaled) for lung disease, currently smoke. • Are residing in the community • Have at their current place of residence (that is, at the location they are maintained in isolation) communication facilities necessary for trial functioning. These are: - Reliable mobile and/or landline phone access - reliable access to email • Capable of giving informed consent which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and in this protocol.

• People aged 50 years and over who have tested positive for SARS-CoV-2 (by any NAAT/PCR based testing system recognised by public health authorities) within the preceding 12 days • Are still symptomatic or have not yet developed symptoms • Have any of the following risk factors: take medication for high blood pressure, take medication (oral or injectable) for blood glucose control, take medication for heart disease, take medication (oral or inhaled) for lung disease, currently smoke. • Are residing in the community • Have at their current place of residence (that is, at the location they are maintained in isolation) communication facilities necessary for trial functioning. These are: - Reliable mobile and/or landline phone access - reliable access to email • Capable of giving informed consent which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and in this protocol.