People living in Sydney and surrounding cities are living under much heavier restrictions today, after the COVID-19 outbreak significantly worsened yesterday.

There are now serious limits on the number of people who can visit at home, capacity limits on businesses and masks are essential in public spaces.

Part of the increased concern was a superspreading event at a birthday party, where at least 30 percent of attendees have now tested positive - with more cases expected.

So on today's Coronacast, as the number of exposure sites in Sydney also continues to grow, what could the city be facing in the days ahead?

Also on today's show:

* I've been fully vaccinated, why am I subject to all state travel restrictions, regardless of my vaccination status?

* Another leak within hotel quarantine, this time in Brisbane