Though the three patients have not yet tested positive, 

So they have a fever and sore throat, which could be anything.

But no explanation if quote above means they tested them or not, and if they did and negative why the quarantine?

This type of reaction, 14 day mandatory quarantine for a sore throat is a pretty sure way to make sure many people don't come forward when there is an outbreak unless sure infected.

And worse than that, as we are seeing schools closed all over just because staff, pupil or parent was in rayong over the weekend no wonder bookings there and places as far away as pattaya and koh samet nose diving before the bank holiday weekend.

From start to finish this whole episode is text book example of what not to do.