Over the weekend, lockdowns ended in WA, NT and Queensland - leaving only Greater Sydney and surrounding areas with heavy restrictions.

New South Wales' health authorities have been battling a much bigger outbreak, but there's hope that it might finally being brought under control.

But many challenges remain, such as an outbreak in an aged-care home and still several mystery cases.

So on today's Coronacast, what's the chance Sydney's lockdown will end this week?

Also on today's show:

• When do you think research will tell us whether or not we should have another COVID-19 shot next year?

• The US, UK, Canada and some European countries are mixing and matching vaccines. When do you Australia will follow suit?