Victoria is back where it least wanted to be: in lockdown. And this time it'll last for seven days.

Perhaps a bit lost among the debate over vaccinations and contact tracing is the fact that an entire state is in lockdown because of another failure of hotel quarantine.

A recent pre-print study on Australia's hotel quarantine system has found that for every 172 COVID positive returned travellers, there's a leak and 57% of the time, it results in a lockdown.

So on today's Coronacast, a look into the last quarantine leak, which could have happened in just 18 seconds.

Also on today's show:

* Australian Technical Advisory Group on Immunisation updates the risk of clotting post AstraZeneca vaccination

* If I am unlucky and do get blood clots from the AstraZeneca immunisation what is the treatment? Can this be treated in country areas?

* Why do some people after a COVID-19 vaccination get symptoms like shivers, aches and pains, headache, sore arm, etc and others don't?