1. Pregnant females 2. Suspected or confirmed to have COVID-19 infection (i.e Navy personnel having positive rRT-PCR test for COVID-19 or presence of fever with cough, shortness of breath, sore throat, anosmia or diarrhoea at the time of recruitment) 3. Presence of pre-existing cardiovascular disease including being on medication for ischaemic heart disease 4. Presence of contraindication to the use of HCQ (on other medications predisposing to long QT or presence of long QT on baseline ECG) 5. Prior diagnosis of retinopathy, G6PD, malignancy or advanced kidney disease 6. Known sensitivity or allergy to Hydroxychloroquine

1. Pregnant females 2. Suspected or confirmed to have COVID-19 infection (i.e Navy personnel having positive rRT-PCR test for COVID-19 or presence of fever with cough, shortness of breath, sore throat, anosmia or diarrhoea at the time of recruitment) 3. Presence of pre-existing cardiovascular disease including being on medication for ischaemic heart disease 4. Presence of contraindication to the use of HCQ (on other medications predisposing to long QT or presence of long QT on baseline ECG) 5. Prior diagnosis of retinopathy, G6PD, malignancy or advanced kidney disease 6. Known sensitivity or allergy to Hydroxychloroquine