A spread without coughing and sneezing does seem to be one that would be prevented by hand washing- which is so heavily recommended by the authorities.
Maybe it’s in the sweat of the asymptomatic?
Aerosolized would explain all of it, and there are clues of that. But no one wants to come out and say it.
The healthcare workers in China, and now other countries are armed with just short of the highest level PPE and hundreds of them got sick.
That’s my theory anyway. Aerosolized also explains how asymptomatic spread it,
When I was reading up on the effectiveness of masks, I read about how just with normal breathing, the virus will be breathed out. And with the normal flu, even someone that isn’t sick will have a certain amount of the flu virus in their exhaled breath.