The Oxford AstraZeneca vaccine has been approved for use in Australia, but it comes with fine print around who should get it.

In its approval, the Therapeutic Goods Administration noted that the "decision to immunise an elderly patient should be decided on a case-by-case basis with consideration of age, co-morbidities and their environment".

While there are no safety concerns for people who are aged over 65, there weren't enough people infected with COVID-19 in the clinical trials to determine efficacy in that age group.

So on today's Coronacast, why didn't the TGA give the Astra vaccine carte blanche for everyone over 18?