Around half of the positive coronavirus cases in the UK are not being identified, according to a pandemics expert. Mark Woolhouse, professor of infectious disease epidemiology at the University of Edinburgh, said these cases mean attempts to control the virus are being done "with one hand behind our back".
Mr Woolhouse sits on a sub-group of SAGE and is a member of the Scottish Government's Covid-19 advisory group. He said the mass testing scheme which began in Liverpool is an attempt combat the problem.
From Friday anyone in the city can be tested - repeatedly - for coronavirus regardless of whether they have symptoms. Speaking on the BBC Scotland's Seven Days programme, Prof Woolhouse said: "The problem that testing pilot scheme in