The transition from Australia being pretty much free of COVID to reopening the border and allowing it in, is a complicated and fraught issue.

The country will eventually have to rejoin the world so people can see family, travel for pleasure or business and go overseas again - but according to experts, there's a list of things that have to happen before then.

The most obvious is a very high level of vaccination, so that when coronavirus does arrive again, it won't result in an overburdened hospital system

And on today's Coronacast, there's also the big issue of possible vaccine resistant variants.

Also on today's show:

* More cases of blood clots and low blood platelets

* A clarification and refinement of the R0 value discussion from last week