Huge if true. Note they’re not saying asymptomatic transmission never happens, just that it seems to be very rare.
That’s been one of the most worrisome aspects of all this. If we really can isolate symptomatic carriers and rely on moderate social distancing for the rest...
Of course governments have to get serious about contact tracing, both to prove this out and to take advantage of this window of opportunity the virus seems to be giving us.