For reference - Airlines run a HEPA filter system which is same as used in hospital theatres - this replaced the air fully cleaned every 3-4 minutes. Or so they say. Also mentions of more deep cleaning - but we all know between short flights, cleaning, is picking up the rubbish.
I think the true figures have yet to establish themselves, as others pointed out - there's no 100% on this one, no one's exactly sure on the incubation period, many might already be walking around with this, unaware - and anyone with a weaker immune system 60+ or underlying issues / respiratory, ...
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...need to wash their hands a few times more.
The answer is they don't have one yet.
1 year+ to a vaccine they can use. We saw the stock markets tank to the worst state since 2008 last week (moved back up a bit). Governments try to re-assure to avoid panic, which affects all markets.
People are easily spooked & above all else, we'll be told whatever we need to be told, in order for us to not start looting and stealing each others canned food. IE we are not told everything - especially as this is still 'new'.
We need to worry if the 3.7 million displaced mainly Syrians, with over a million sitting on Greece's border trying to break through to the EU - they are in terrible conditions & if it spreads within that community & there becomes a large movement of people & potentially many breaking through the borders, then this has the possibility to spread rapidly. We should be worrying why 3.7 million are homeless which we are turning a blind eye to when some gas bombing facist is killing his own people but that's a different conversation.
General recommendations of 'don't shake hands or greeting kiss' & handwashing are about as much as we can do - along with the avoiding large crowds and perhaps confined areas with many people. They say don't touch you face - but we do 1000 odd times a day, so that won't be too easy (best avoid eyes / mouth).
Cheap surgical masks are not up to the task of multiple uses, virus droplets can go into the eyes and ears - so masks aren't fully effective.
I've noticed my cousins Chirpody surgical masks have climbed from 0.25c to €5.00, anything with anti-germ or wash sold out all local supermarkets - people starting to panic. Don't, there's little we can do other than 'the basics' & wait.