Also Read | The race to take fashion retail online"The MCG is being investigated as a potential source for the infection," Victoria's Department of Health said.A race is now on to trace and test an estimated 7,000-8,000 fans, and to find out if one of the highest-attended sporting events since the pandemic began was a super-spreading event."We're encouraging anyone who was in The Great Southern Stand, zone 5 of the MCG between 12.30pm and 3.30pm on 27 December, to get tested and isolate until they receive a negative result," health authorities said.The Boxing Day Test is a centrepiece of Australia's sporting calendar and just under 30,000 people attended this year, well short of capacity.Several retail stores in the Chadstone Shopping.