As we can see from what's happening around the country, the Delta variant has changed the game when it comes to controlling the spread of coronavirus.

It seems unlikely Sydney will ever regain control, and there are major battles in ACT and Melbourne.

The Delta variant has surprised virologists with how it popped into existence and how it has so rapidly taken over.

But not all is lost. On today's Coronacast, the three scenarios of where we could be headed next.

Also on today's show:

* A worrying risk of double infections in children

* What's going on with NSW contact tracing?