Until yesterday, the outbreak in Brisbane looked small and manageable, but it just shows how fast things can change in a pandemic.

Today is the first day greater Brisbane will spend in at least a three day snap lockdown, after a rise in community transmission cases.

So on today's Coronacast what changed so quickly? And why do we need lockdowns now when we have vaccines?

Also on today's show:

* My parents have just had the COVID vaccine and are flying to Melbourne from Queensland. Will the vaccine cause them to test positive?

* When will I receive my vaccine? I'm of Aboriginal/Torres Strait Islander descent. Will the vaccine stop me from getting COVID-19 and or spreading it?