Testing is being held up as the world's best bet for ending the economically crippling -- and emotionally draining -- coronavirus lockdown.
But some doctors at the Italian epicentre of the health crisis doubt that countries can test their way out of confinement.
"It is a nonsense," Milan's Polytechnic Institute professor Davide Manca said. "Conceptually, I am sceptical."
"Even if you raise that number 10 times, that would still take 200 days for one test. That's six or seven months."