You might have thought we were finally getting on top of coronavirus, but the pandemic is not without its surprises.

There's been a few cases in the past few days that have health authorities scratching their heads.

Two school kids in Sydney have tested positive, and there's a case in Queensland that apparently dates back to the Ruby Princess.

So what's going on? And what might it say about the level of community transmission of the virus?

On today's show:

* What do the cases in Sydney schools mean for community transmission numbers?

* Is coronavirus more common out in the wild that we thought?

* How can there be another case from the Ruby Princess?

* Are enough people still getting tested to give a true indication of the spread?

And Norman's here to explain the latest from the vaccine trial that's just started in Australia. But how can they test it here if there are such low active cases?