A leading Australian virus expert has called for calm about a spike in coronavirus cases possibly linked to Sydney's Northern Beaches cluster. Professor Peter Collignon said the current outbreak is far less concerning for New South Wales than the Crossroads Hotel cluster which infected 57 people in July. He is confident that with the restrictions on gatherings now in place, the number of daily cases will teeter out by early January. But other experts in the field of infectious disease are sounding the alarm and calling for Greater Sydney to go into a full scale lockdown. A Covid-19 drive through testing clinic at is pictured at the Crossroads Hotel in Sydney's southwest