The Doherty Institute Model is the hottest ticket in town, with everyone from politicians to punters talking about what happens when we reach 70 and 80 per cent vaccination levels.

But there are a lot of assumptions that have to be made to come up with a model, and Doherty Institute's plan is no different.

Among other things, it assumes a certain level of cases, a functioning contact tracing system even at high numbers and vaccines that keep us immune to COVID-19.

But on today's Coronacast, how valid are those assumptions in the real world?