Number of sick days (SDS) during the study period: The number of sick days will be obtained from participants medical records as defined as the number of days deemed 'not fit for duty/work' by their reviewing medical professional; and will be compared between participants randomised to chloroquine and vitamin C.[12 weeks post-commencement of the IMP. Study to commence Apr 2020.]

Number of sick days (SDS) during the study period: The number of sick days will be obtained from participants medical records as defined as the number of days deemed 'not fit for duty/work' by their reviewing medical professional; and will be compared between participants randomised to chloroquine and vitamin C.[12 weeks post-commencement of the IMP. Study to commence Apr 2020.]