Sydney’s Delta strain outbreak could increase to over 3,000 new infections per day, according to one prominent microbiologist, who is calling for restrictions in the region to be extended. Professor Brendan Crabb, director of the medical research body, the Burnet Institute, issued the warning on Aug. 19. He said the situation in Australia’s most populous state—New South Wales (NSW)—could escalate into a “catastrophe” and that it was of national concern. “We are in a steam train that is heading towards a cliff, not heading towards a station, which is where we should be going,” Crabb told the Today show. “Last time I spoke on this program, we had 97 cases 30 days ago. We are now at 600. If we speak again in 30 days, it will be three to 4,000 cases,” he added. “That is what we’re on track for at the moment,” he said. “That’s a catastrophe from …