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South Australia Set To Enter Lockdown Tonight, After Five Covid Cases Detected

The bulk of Australians will soon be living in lockdown with South Australia set to join Victoria and large parts of NSW under tough restrictions.

More than half of Australia's population will soon be in lockdown as health authorities continue to battle coronavirus outbreaks of the infectious Delta strain.

South Australia will enter tough restrictions for one week from 6pm on Tuesday after five cases of the variant were detected in Adelaide.

Nine new local cases in Victoria have sparked a seven-day extension to the state's lockdown which is now set to stretch until at least next Wednesday.

Victoria is also banning all travel from NSW for two weeks under new rules which will only exempt authorised workers and people with compassionate reasons.

NSW recorded 78 new local cases spread across Sydney with 29 spending part or all of their infectious period in the community.

While the Sydney and surrounds lockdown is slated to end on July 30, there's increasing concern an extension may be needed as the virus circulates in the nation's biggest city.

Reimposing restrictions in SA means more than 13.5 million people will be living under harsh stay-at-home orders across the nation.

Australia's vaccine rollout continues to lag behind much of the developed world with just 13.7 per cent of people aged over 16 receiving both jabs.