Urgent warning for commuters after an infected passenger travelled all over Sydney during peak hours as another shopping centre is put on alert - so were YOU on a corona-train?

A health warning has been issued to people who caught several busy trains during peak hours, after new COVID-19 cases were identified on routes. 

NSW Health issued a warning for train passengers and two businesses in south-west Sydney on Saturday, as newly discovered coronavirus clusters continue to spread.

People on trains between Eastwood, Parramatta and the city on October 6 and 7 may be at risk.

Busy shopping centre Narellan Town Centre, in Sydney's south-west, was also identified as a location a case attended. 

NSW Health issued a warning for train passengers and two businesses in south-west Sydney on Saturday (pictured, testing in August)

People on trains between Eastwood, Parramatta and the city on October 6 and 7 may be at risk (pictured, a Sydney train on May 25)

It contains businesses such as a Woolworths, Kmart and a Big W. 

Anyone at the centre on October 8 between 12.30pm and 2pm, and a coffee shop called Squeeze & Grind in nearby Camden on October 7 between 11.45am and 1.15pm, are considered casual contacts and must monitor for symptoms.

If symptoms present, people must get tested immediately and isolate until results come back.

The owners of Squeeze & Grind took to social media to apologise to customers for their sudden closure.

'We are still taking all of the necessary steps and following procedures from our end, whilst already initially having the correct steps in place which enabled this to be tracked instantly,' the post said.

They confirmed the business was being deep cleaned and will reopen on Monday after additional deep cleaning of their courtyard.  

One of the businesses was Squeeze & Grind coffee shop , with an alert for customrs who attended on October 7 between 11.45am and 1.15pm

The owners of Squeeze & Grind took to social media to apologise to customers for closing suddenly

LOCATIONS WHERE PEOPLE WITH COVID-19 HAVE BEEN: 

Must isolate immediately:

Carlingford Fitness First - October 3 8am to 9.15am

Anyone in the pilates class must isolate immediately and get tested, anyone else at the gym outside of the class is considered a casual contact and must monitor for symptoms.  

Milson's Point: Ripples restaurant - October 3 between 8pm to 10.30pm 

Must monitor for symptoms:

Artarmon Mazda service centre - October 2 between 7.30am and 9.30am 

Castle Towers Shopping Centre - October 5 between 12pm to 1pm 

Surf Dive 'n' Ski, Castle Towers Shopping Centre - October 5 between 12pm to 5pm

Aldi Eastwood - October 6 between 11am to 12pm

Eastwood: S-mart - October 5 between 7.30pm to 7.45pm

Epping: Chemist Warehouse - October 6 between 10:30am to 11am 

Penrith Homemaker Centre - October 4 between 11am to 1pm

Kmart, Narellan Town Centre - October 2 between 6pm to 7pm

Macquarie University Sports and Aquatic Centre outdoor pool area - October 7 between 5:30am to 10:30am

Palm Beach Fish & Chips - October 5 between 3.45pm to 4pm

Westfield Parramatta

Penrith: Guzman y Gomez - October 4 between 1:30pm to 2pm

Penrith: Home Co - October 4 between 2pm to 2:30pm

Potts Point: Monopole restaurant - October 4 between 6pm to 8pm

Sydney: St Vincent's Hospital - October 7

 Locations added October 10:

 Both are considered 'casual contacts' and must monitor for symptoms

It comes as NSW recorded three new cases on Saturday - including one in hotel quarantine.

The other two cases were a St Vincent's Hospital nurse and someone who had been in contact with staff member. 

NSW Health has issued a public alert, saying the casual nurse worked an evening shift on Wednesday.

'It is believed the nurse provided specialised care to a single patient, and had limited contact with a very small number of colleagues,' NSW Health said in a statement on Friday night.

Narellan Town  Centre (pictured, a busy shopping centre in Sydney's south-west, after an infected shopper went there on October 8 between 12.30pm and 2pm

There were hopes NSW would be declared COVID-free after 12 days with no community transmissions. 

But that streak was broken on Wednesday where three new cases in south-west Sydney were identified, and many more have since been recorded.

'It's not a surprise ... and my expectation is that will happen again,' NSW Premier Gladys Berijiklian told reporters on Wednesday.

'We're always going to have cases pop up because we're in a pandemic, but we're also in an economy that is open, where people are undertaking their business, where we don't have borders but for Victoria.

'We're managing it well, but we will never be out of the woods until there's a vaccine.'

AFFECTED BUSES AND TRAINS 

▪️Train from Parramatta at 2:42PM arriving at Town Hall at 3:31PM on October 4.

▪️Train from Town Hall at 5:29PM arriving at Kings across at 5:50PM on October 4.

▪️Train from Artarmon at 11:18PM arriving at Central at 11:48PM on October 5.

▪️Bus replacement from Central at 11:48PM arriving at Strathfield at 12:15AM on October 6.

▪️Train from Strathfield at 12:15AM arriving at Parramatta at 12:45AM on October 6.

▪️Bus 550 from Epping Ststion, Beecroft Road, Stand D at 5:08PM to Smith Street after Phillip Street, Parramatta at 5:41PM on October 6.

▪️Train from Moss Vale at 4:52AM arriving at Liverpool at 7:09AM on October 6.

▪️Train from Liverpool at 4:58PM arriving at Moss Vale at 7:12PM on October 6.

▪️Train from Moss Vale at 4:51AM arriving at Liverpool at 7:08AM on October 7.

▪️Train from Campbelltown at 1:31PM arriving at Moss Vale at 3:50PM on October 7.

 Public transport routes added October 10: