Scores of people at a popular Sydney market may have been exposed to the coronavirus after a person worked at the event while infectious.
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The positive case attended the Sydney Markets at Flemington on August 9, but tested positive a week later.
Close contacts have been identified and advised to isolate themselves for two weeks and get tested.
Anyone else who attended the market between 8am and 4pm are considered casual contacts and must monitor for symptoms.
The market has been thoroughly cleaned and NSW Health says there is no ongoing risk to the public.
The positive case is among the growing number that have unknown sources, which are concerning authorities.
The undetected spread of COVID-19 in Sydney's west and southwest continues to worry health authorities.
Premier Gladys Berejiklian says NSW recorded just seven new coronavirus cases in the 24-hours until 8pm on Sunday, but she remains more anxious than ever about the spread of infections where the source is a mystery.
"That is a big concern because ... Melbourne didn't get worse because of the number of cases they had," she said on Monday.
"They had undetected community transmission which then unknowingly got to a stage where it ... formed a number of different clusters and we certainly don't want that to happen here."
The seven new cases were detected from 10,806 tests, with one case a returned overseas traveller in quarantine while the other six were acquired locally.
Chief Health Officer Kerry Chant fears some people with respiratory symptoms are not getting tested as they assume they have the flu when it is far more likely they have COVID.
"Every day, we are identifying one or two cases of unknown source," she said.
It comes as tough new rules are announced to stop the spread of the virus in NSW schools.
Formals, dances, graduation ceremonies, choirs and all social events have been banned and students must remain within their relevant class or year groups.
Dr Chant said the rules applying to public schools would come into effect on Wednesday, but that she has written to private schools asking them to also abide.
"It is also being done with the spirit of trying to make sure that our schools can maintain their on-site learning," she said.
Under the new guidelines anyone with COVID-19 symptoms is prohibited from returning to school until a negative test result has been reported.
Schools must not travel outside their local community or zone and interschool sport and zone carnivals are restricted to 100 people per venue and held locally.
Spectators, including parents and carers, won't be allowed on school grounds or at sporting events held during school hours.
Schools may hold a Year 12 assembly at school without parents to recognise the completion of studies or consider delaying events until later in the year.
However, students and staff required to support HSC students are permitted to meet their HSC requirements with COVID-19 safety measures in place.
Sydney Girls High School - the latest to close because of a COVID infection - said a trial HSC exam set down for Monday would be rescheduled.
Tangara School for Girls in Sydney's northwest, which has been linked to 25 cases, remains closed.
Three of Monday's locally acquired cases were close contacts of the cases linked to the Chopstixs restaurant at Smithfield RSL, and two were close contacts of a case linked to Our Lady of Mercy College at Parramatta whose source was still under investigation.
One of the OLMC contacts attended Sydney Girls High while infectious on August 6, 7, 10 and 11.
NSW Health said people who had tested positive had attended:
* Parramatta Local Court on Tuesday, August 11 and Wednesday, August 12 between 8.30am and 12.30pm
* Woolworths Metro North Strathfield on Saturday, August 8 between 12.50pm and 1.15pm
* DFO Homebush on Saturday, August 8 between 10.45am and 12pm.
Australian Associated Press
