Boost me baby! Should we all actually have three doses?

It's well known by now that you need to have both doses of whatever vaccine you have for the best possible protection against coronavirus. But what if it actually takes three shots to get there? We are learning more and more about immunity against COVID-19 from overseas experiences, including a successful booster program in Israel. So might the ol' two dose vaccine regime actually take three? That's on today's Coronacast.