The national vaccine rollout has suffered another setback, with the federal government now saying that only people over 60 years should get the AstraZeneca vaccine. It's likely to set the date to full vaccination back even further as Pfizer vaccine supplies are limited and it'll be months before Novavax and Moderna vaccines arrive. It's also left many wondering what they should do if they've had their first AstraZeneca dose, and what are the new levels of risk for their age group? On today's Coronacast, with Australia's two largest cities fighting COVID-19 - how vulnerable are we? Also on today's show: * The latest on the Sydney outbreak * No Quick Fire Friday today sorry :( What do you think we are? Timelords?!