When you think of a coronavirus outbreak on a graph, you probably imagine a big peak and then a swift downward curve as lockdown measures bring the number of infections under control.

But Victoria's recent spike looks pretty different. A record-breaking daily tally is followed by a fall in cases before infections suddenly rise again.

And also, why has this happened in Victoria? Is it just unlucky or could there be more to it?

Health reporter Tegan Taylor has been speaking to some epidemiologists about Victoria's unusual spike and fills in Norman Swan on what they think is going on here.

On today's show:

* Another day, another massive amount of cases in Victoria. Why isn't it going down?

* Why is it different from the first time we were in lockdown?

* If coronavirus is on playground equipment, will the rain wash it off?

* Do we really need to wash the groceries? It takes one hour to buy them and another two hours to wash and dry them.

* Since March, people have been arguing that the mortality rate is much lower than the documented case mortality rate by a factor of five to 10 times. What do we know about the mortality rate of COVID-19?