All close contacts have been put in isolation and the cases are being interviewed Victoria to shut borders to Wollongong and Blue Mountains from New Year's Eve New South Wales recorded 18 new coronavirus infections on Wednesday Tens of thousands of Boxing Day shoppers at a busy Melbourne Westfield have been ordered to isolate after six stores were visited by coronavirus patients. Three mystery coronavirus cases - all woman, two aged in their 40s and one in her 70s - have emerged in Victoria. ADVERTISEMENT Authorities believe at least one of the cases is linked to the Sydney outbreak. The new infections end the state's 61-day streak without any new cases, and all 40 close contacts of the three people have been put into isolation.