How did it all go so bad so quickly?

If you haven't been paying attention to the news over the weekend, there's some bad news. Sydney is in lockdown. Darwin is too. And there's new restrictions for Perth. Rather quickly, coronavirus has found its way around the country from the east to the west and to the top end. So on today's Coronacast, what has happened and how did it all go so badly so quickly? Also on today's show: * Re-examining symptoms: what are the most common if you're unvaccinated, if you've had one dose and if you've been fully vaccinated.