[mattmanser]

I think they don't know yet, even the US were saying it might be 25-50% a couple of days ago. For example the testing of the aircraft carrier, one of the few cases of total population testing, showed 60% asymptomatic cases but had a young population, and it's not clear from the information we've heard publically if some of those will develop symptoms later.

So at the moment no-one really knows for certain.

[Lewton]

60% asymptomatic at the time of testing

Most of them will eventually begin showing symptoms