I wish there was some information in that article/the WHO statement rather than vague terms like most and rare. Specifically, I'd like to know which countries she's talking about. There was a paper published a couple of months ago about how one person in China, either pre- or asymptomatic, I don't remember which, infected a dozen or more people in a restaurant. It was pretty nifty how they mapped out the ventilation pattern and it matched who got sick. Some of these people were 15-20 feet away and had no contact with the carrier whatsoever.
But the virus that's in Europe and the US is a different strain. I'm hoping that the data the WHO person is citing are from Europe, and that the deadlier strain that's in Europe and the Americas is less transmissible than the Asian strain.