NSW's Covid infection rate may take days to decline - Premier

It may take until the end of the week before Sydney's daily Covid-19 infection numbers start to decline.

NSW Premier Gladys Berejiklian. Source: Getty

Gladys Berejiklian says she expects a lag of between five or six days until cases begin to drop as a result of the latest lockdown restrictions.

The NSW premier admits her decision to impose the harshest measures yet on the Harbour City has caused her anguish.

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The Australian state recorded 105 community cases and one death on Sunday. Source: Breakfast

"I'm not embarrassed to say that in public life, yesterday was probably the most difficult day I've had personally," she told reporters yesterday.

Stay-at-home orders have been tightened in Fairfield, Canterbury-Bankstown and Liverpool with locals not allowed to leave until July 30.

Tougher restrictions also apply to the entire Greater Sydney region, with only supermarkets, pharmacies, banks and few other retailers allowed to open and construction sites shut.

NSW recorded 105 new virus cases and the death of a woman in her 90s in Sydney's southeast on Sunday.

Berejiklian said 27 had been infectious while in the community.

"That's the number that worries us the most, we've seen that number crop up day in and day out," she said.

A total of 66 of Sunday's cases were linked to known clusters while 39 remain under investigation.

The state is yet to see a significant drop in case numbers despite some form of lockdown conditions in the capital for three weeks.

"We are throwing everything at this, we want to come out of this lockdown as soon as possible," the premier said.

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The majority of yesterday's cases were concentrated in southwestern Sydney, with 69 found in the Fairfield local government area.

However, Chief Health Officer Kerry Chant said Sydneysiders needed to be vigilant citywide.

"Every time you leave your house, it is critical that you assume you are coming into contact with Covid," she said.

Unfortunately not everyone is paying heed to the advice, police say.

Officers responded to some 860 reports from members of the community concerned about health order breaches on Saturday, according to Deputy Commission Mal Lanyon.

They included a woman who visited Sydney overnight before returning to the Newcastle area and numerous people who tried to run off or resist arrest for failing to wear masks.

In all, more than 240 people were issued AU$200 (NZ$210) fines.

Initially, there were exceptions to the movement controls imposed in the three southwestern council areas for health and emergency services workers.

However, the list has been expanded to include retail workers in shops permitted to open as well as teachers and freight drivers.

The localised lockdown has prompted a harsh response from some within the medical community.

The Doctors Reform Society says enough Pfizer vaccine to administer to all 600,000 adults who live within the three municipalities should be provided within the next fortnight.