There's relief - and a few nerves - as workers on the Covid-19 frontline learn they could have a jab by the end of next month. Medsafe has approved the Pfizer/BioNTech vaccine that's already been given to millions around the world for use here. First in line are border and managed isolation workers and their families, then those health workers most at risk of encountering the virus. Health correspondent Rowan Quinn spoke to some who'll be at the front of the queue.