1. Prior COVID-19 2. Presence of any respiratory illness inclusive of fever, cough, dyspnoea, sore throat, rhinorrhoea, nasal stuffiness, headache, myalgia and fatigue 3. Any cardiac arrhythmias, retinal eye disease, liver or kidney disease 4. Any contra-indication to hydroxychloroquine or chloroquine including allergy or hypersensitivity 5. Any concurrent medication which can prolong QT interval 6. Currently taking or planning to self-treat with hydroxychloroquine or chloroquine 7. Immunosuppressive conditions or medications 8. Pregnancy or breast feeding 9. Concurrent participation in other COVID-19 clinical trials 10. Inability to follow study procedures during the trial period 11. Inability to provide informed consent 12. Lack of fluency in the English language as this will impede the ability of the participant to interact with the web-based data collection platform

1. Prior COVID-19 2. Presence of any respiratory illness inclusive of fever, cough, dyspnoea, sore throat, rhinorrhoea, nasal stuffiness, headache, myalgia and fatigue 3. Any cardiac arrhythmias, retinal eye disease, liver or kidney disease 4. Any contra-indication to hydroxychloroquine or chloroquine including allergy or hypersensitivity 5. Any concurrent medication which can prolong QT interval 6. Currently taking or planning to self-treat with hydroxychloroquine or chloroquine 7. Immunosuppressive conditions or medications 8. Pregnancy or breast feeding 9. Concurrent participation in other COVID-19 clinical trials 10. Inability to follow study procedures during the trial period 11. Inability to provide informed consent 12. Lack of fluency in the English language as this will impede the ability of the participant to interact with the web-based data collection platform