Experts want more mask-wearing to minimise Covid-19 spread

Some experts want masks to be made mandatory in indoor public spaces, to minimise the chances of Covid-19 spreading. In Greater Sydney, they must now be worn in indoor areas such as supermarkets, shopping centres and retail stores. But here, they're only mandatory on public transport. Max Towle speaks to an epidemiologist at Deakin University in Melbourne, Professor Catherine Bennett.