Singapore has been following the instruction from WHO.
See at us now , we had been lock down aka CCB. If we have close our door much earlier from Chinese visitor from anywhere the world, have initiative and wear our masks and wash our hands regularly.
But these Smart scholar prefer to look at WHO but don't want to look at Vietnam, Taiwan , HK or even Macau on what they had been doing right all this while. These country has their own way of doing things we should have look for them as example.