Some of New Zealand's leading epidemiologists have long warned a leak at the border was a very real prospect given perceived shortcomings in the country's managed quarantine process. There are fears a Northland woman who tested positive to Covid-19, 10 days after undergoing the MIQ process, could spark a spread of the virus in the community. Professor Michael Baker has called for tougher requirements on travellers wanting to enter the country. He speaks to Susie Ferguson.