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Ed, I don’t think that’s yet known.
There a good article from Saturday that covers how it gets through the control measures quite well: https://www.theguardian.com/world/2020/mar/07/coronavirus-a-disease-that-thrives-on-human-error?CMP=Share_iOSApp_Other
A series of small mistakes, not quarantining the right people at the right time causing widespread infection. Not tracking people from infected areas so having infected people walking about for days infecting others before being identified. Nothing about affectionate greetings as that’s a bit of a red herring.
If you're infected you’ll likely have the infection on your hands so just shaking hands and the other person touching their eyes will do it. Imagine all those people at a funeral holding the hands of the daughter before wiping away a tear.
I can’t see any citation on that, what @M_V I think want to know what was the official reason to how it spread so fast without any prejudice clouding it (like the claim that kissing cheek and such is one of the reason).