Australia's most senior practising doctor has called for a tougher lockdown across all of Greater Sydney as Covid cases number remain high. Australian Medical Association president Dr Omar Khorshid, a Perth-based hip and knee surgeon, said Covid-19 didn't recognise suburb boundaries and called for more stringent rules across Australia's biggest city to slow the spread of the virus. Residents of eight council areas in Sydney's west and south-west are living under tighter restrictions, with the whole of Greater Sydney under lockdown until at least August 28 as cases numbers of the highly-infectious Delta strain stubbornly remain in the triple digits, after five weeks of less freedom.