Mirroring a similar boon to the US economy, Spain is seeing a virtuous circle where an influx of foreign workers is boosting the supply of labour and raising its economic growth rate
"We had an exponentially growing curve of infections which we interrupted at a certain time," the epidemiologist told the BBC's Andrew Marr programme.
"We don't have the ability right now to measure how many people have been infected, that will come with antibody tests, and so we are making statistical estimates of that and those are subject to a certain degree of uncertainty.
"We think it could be anywhere between about 7,000 or so up to a little over 20,000."