Australian state announced lockdown rules on Tuesday to combat the COVID-19 Delta variant spread, with South Australia entering week-long restrictions, joining an extended lockdown in Victoria and a five-week shutdown in Sydney.Australia’s most populous state New South Wales (NSW), of which Sydney is the capital, is battling the worst COVID-19 outbreak of this year, with total cases exceeding 1,400 since the first case was reported more than a month ago in a limousine driver who transported overseas airline crew.NSW authorities reported a slight slowdown in new cases on Tuesday as infections fell to 78 from 98 a day earlier as Sydney and some surrounding areas endure a fourth week of lockdown.