It sounds like a lovely holiday: a week or two in Melbourne, see the sights before travelling north to the picturesque sandy beaches of Jervis Bay.

Well, it's nice if you're a person. If it's the coronavirus variant of concern known as Delta, it's not not really a getaway you want to be part of.

According to Victorian health authorities, the Delta cluster they're battling has been traced back to a guest from early May who came through hotel quarantine.

On today's Coroncast, why that discovery will hopefully help them end the lockdown on time.

Also on today's show:

• More about getting your 2nd Pfizer dose in Victoria

• Is there any evidence that vaccinated people are shedding the virus post vaccine?

• Do mRNA vaccines change your DNA?

• What happens if you don't get vaccinated by the time Australia reopens to the world?