An uncle and his nephew, from the northern suburbs of Epping and Lalor, were tested together on Sunday: the uncle for his routine monthly test, the nephew because he had some symptoms, according to Health Department sources. Their results came back positive on Monday. By Tuesday several close contacts had tested positive, including “case 5”, the man contact tracers identified as the “index case” at the centre of the cluster, who moved through Melbourne for several days while infectious before getting tested. By Wednesday morning the cluster had grown to 15 and on Wednesday night, when...