Study finds hydroxychloroquine does not prevent people catching Covid-19

US scientists found medics taking the drug no less likely to catch coronavirus Hospital staff had equal risk whether taking hydroxychloroquine or a fake pill There was also no difference in illness severity in group of eight who got sick US President Donald Trump said in May he was taking the drug to protect himself Australian researchers say they are 'undeterred' and will keep studying hydroxychloroquine as a hopeful preventive