\"Well so far it's actually reassuring that nearly all the cases they're finding are known contacts of people who have already had infection,\" he told Sky News host Chris Kenny. \"In other words most or nearly all should already be in isolation and so not really a threat to other people. Professor Collignon also said a 50-year-old female healthcare worker in a nursing home is the only \"unlinked\" case of coronavirus – otherwise all other cases have been \"linked\". It is reassuring that \"nearly all\" the coronavirus cases being found in Melbourne are known contacts and should be in isolation and not really a threat to other peop...Victoria has recorded six new locally acquired cases of coronavirus on Wednesday. The areas of concern are Craigieburn Central, Bay Street/ Clarendon Street in South Melbourne, Pacific Epping, Broadway Reservoir shopping strip, Station Street Lalor shopping strip and Brimbank shopping centre.