New South Wales records no new cases of coronavirus as new alerts are issued for venues in western Sydney and the south coast

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New South Wales has recorded no new local cases of coronavirus but officials have added more venues to an alert list amid fears the disease is spreading undetected.

New venues in the western Sydney suburb of Wentworthville include BWS, Domino's Pizza, Woolworths, Green Farm Meat NSW Halal, Udaya Supermarket, Ambeys Big Apple, Sri Lakshmi Supermarket, Pizza Hut and Swagath Biryani House.   

A new testing clinic has been opened near the Wentworthville Community Centre in response to the alerts.

There are also concerns the virus will spread on the state's south coast after a positive case visited Kangaroo Valley's Nostalgia Factor shop on December 27 from 11.20am to 11.30am and Huskisson's Taj Indian restaurant on December 27 from 4.45pm to 5.20pm. 

Anyone who attended should monitor for symptoms and get tested. 

Masks have been made mandatory for the Australia-India Test match at the SCG which started on Thursday. Pictured: Fans stand for the national anthem

There were 27,879 tests reported to 8pm last night, compared with the previous day's total of 32,667. Six new cases were recorded in returned travellers in hotel quarantine.

Meanwhile, a mystery case reported on Wednesday still hasn't been linked to a cluster. The mystery case was man in his 30s from western Sydney who had no known links to a cluster at Berala.

'We are being very cautious about finding any of those missing chains of transmission,' NSW Chief Health Officer Kerry Chant said on Wednesday. 

Acting Premier John Barilaro revealed on Thursday morning that the case remains a mystery.

He told ABC News: 'We're still mindful of that under investigation from yesterday's numbers there is an individual that we're just following through their tracks and of course, you know, we're always alarmed when we're not 100 per cent sure about an individual case.'  

Masks have been made mandatory for the Australia-India Test match at the SCG after a fan who attended the Melbourne Test on 27 December tested positive.

Fans must wear a face-covering at all times unless they are eating or drinking, said Health Minister Brad Hazzard. 

Fans wear masks in the members pavilion during the third Test Match between Australia and India at the SCG

The Test is going ahead with 12,000 fans filling 25 per cent of the stadium - but people from Berala, Auburn, Lidcombe North, Regents Park, Rookwood, Wentworthville and Belmore are banned. 

Acting Premier John Barilaro has also urged regional Australians not to go to the game.

'The risk would be that if someone from the regions comes to Sydney they could take [coronavirus] back to a regional area. My advice to people would be - think about it, reconsider, maybe this year isn't the year to come to Sydney,' he said.     

On Tuesday an alert was issued for country NSW after an 18-year-old man drove from Berala to Orange, Nyngan and Broken Hill on a road trip with friends over the New Year weekend before testing positive. 

The man got a text from NSW Health saying that he had been at Berala BWS, which is the centre of a cluster, on Christmas Eve. He decided to get tested after suffering a runny nose on Monday morning and his friends have tested negative.

Chief Health Officer Dr Kerry Chant thanked the young man for coming forward after getting the sniffles. 'This gentleman was totally unaware of the issues, acted promptly on our text message and thank you so much,' she said.

An 18-year-old man visited the Birdie Noshery (pictured) in Orange on Sunday 3 January from 12.30pm to 2.00pm while potentially infectious

A Covid-19 cluster in Berala has been caused by a patient transfer worker who took a family of returned overseas travellers to a health facility. Pictured: A map showing where Covid-19 cases have been recorded since 16 December

The man visited the Birdie Noshery in Orange on Sunday 3 January from 12.30pm to 2.00pm. 

He also stayed at the Ningan Riverside Tourist park from Saturday 2 January to Sunday 3 January and attended Broken Hill's Gourmet Cribtin restaurant on Saturday, 2 January from 10am to 10.40am.

The man filled up fuel at Broken Hill Shell on Saturday, 2 January from 10.52am to 10.55am and at Nyngan BP on Sunday, 3 January from 9.10am to 9.13am.

Regional New South Wales has not had a case of Covid-19 for weeks and has much more relaxed restrictions than Sydney, sparking concerns that any outbreak could spread rapidly.   

Acting Premier Barilaro, who is filling in for Gladys Berejiklian while she has a week off, said there would be no lockdown for western Sydney for now - but it could happen in the future.  

'The health advice says that there isn't a need to do anything further than the current restrictions,' Mr Barilaro told ABC Radio National on Tuesday.

On Wednesday thousands of cricket fans who went to the second day of the Australia-India Test match at the MCG were urged to get tested for coronavirus after a fan was diagnosed with the disease.

The man watched the game from zone 5 in the Great Southern Stand between 12.30pm and 3.30pm on 27 December.

About 8,000 fans who were in that zone are being urged via text message to get tested.

The man is a 'mystery case' meaning contact tracers do not know where he caught his infection.

Officials do not believe he was infectious at the MCG but want fans to get tested to find out if they may be the source of his illness. 

The man also visited Chadstone Shopping Centre on Boxing Day from 6am to 2pm, and may have caught his infection there. 

The Victorian government wants anyone who went to Culture Kings, Huffer, JD Sports, Jay Jays, H&M, Uniqlo, Myer, Superdry and Bunnings on that day to get tested.  

The man also went to a Christmas Eve function with a person from New South Wales - but officials do not think he caught the infection there because the person was not unwell. 

The man got tested on 3 January and his result was returned on 5 January.

Officials believe his infection is likely from a second cluster and not linked to an outbreak at the Smile Buffalo Thai restaurant in Black Rock, which has 27 cases. 

Genomic analysis will on Thursday afternoon confirm if his infection is linked to any outbreaks in New South Wales which emerged after 16 December. 

Victoria recorded no new coronavirus infections on Thursday.

Thousands of cricket fans who went to the second day of the Australia-India match at the MCG are being urged to get tested