Child has been on medication for 48 hours. In the absence of other symptoms then he is probably ok. If he was going to have additional reactions it would have happened by now. The steroids will be making a difference. Long term I hope they are continuing some sort of followups to determine what happened. It does sound like a reaction that resulted in poor oxygen levels (the blue/blackness). Which is one reason for the steroids.

At the same time there are several conditions that can follow an ear infection/antibiotics and I would be concerned for everyone - and especially this close to Christmas as you do not want to put any of your own or daycare families in jeopardy this time of year because then it would spread to the wider community due to family gatherings.

You don't say the child's age but I am guessing not very old from the behaviours. If you think you can keep the child separated in a play yard area then that would help a bit. I probably would be looking for a minimum of 72 hours on medicine to be sure there is 3 days as that is about when a reaction to the new medicine will start or the old problem will flare up again.