The government has been urging Australians to embrace covid vaccines but now that phase 1b is just days away, the infrastructure underpinning this is being put to the test.

About 6 million Aussies fall into the coming phase, and about 1000 GP clinics are part of the rollout plan.

But many people, keen to get the vaccine and trying to book appointments, are being told clinics listed on the government website aren't part of the rollout, or that they haven't yet received vaccines and don't know when they will.

On today's Coronacast, why is it so hard for Australia to scale up its vaccination rollout? And do these early delays risk putting people off getting their shots?

Also on today's show:

* A look at why Germany may have halted the AstraZeneca rollout