You might have heard a friend or family member say 'I'm waiting for Pfizer', on the assumption that the mRNA vaccine works better than others.

But according to a recent study from the University of Oxford, immunity from the Pfizer vaccine may actually start to wane faster than AstraZeneca.

A month ago, Israel began a program of booster shots, giving older people a third shot of the vaccine to try and help tame a growing outbreak of the Delta variant.

So on today's Coronacast, what do we know about how long immunity may last?

Also on today's show:

* What effect would it have on our community if those who are fully vaccinated were given some benefits, such as reduced restrictions?

* When do we stop contact tracing altogether?