7NEWS Update: Monday December 28, 2020

Health officials are scrambling to find the sources of five mystery COVID cases in Sydney not yet linked to the Northern Beaches cluster; new data shows the Oxford COVID-19 vaccine jab already being produced in Australia, is 100% effective in preventing severe cases; and police have faced off with more than 100etnagers at an out of control party at an AirBnB in Perth. More news across the day on 7NEWS.com.au and 7Plus. Hosted on Acast. See acast.com/privacy for more information.