Genomic sequencing is under way for all three cases and results are expected within 48 hours.

The results will show whether the driver contracted the virus from an international crew member, which is the most likely scenario.

The man attended the Forest Rangers FC Little Rangers session at Gannons Park in Peakhurst on Friday between 4.30pm and 5.30pm.

Anyone who attended is considered a casual contact of the man but NSW Health is urging all adults who were present to get tested immediately and isolate as a precaution until they receive a negative result. Children in attendance should be monitored for symptoms and get tested if any occur.

The driver employed by Sydney Ground Transport returned a positive test at 7am on Wednesday, prompting the NSW government to explore greater restrictions for international aircrew entering the state.

He developed symptoms on Saturday but did not get tested until Tuesday, sparking concerns he may have exposed others. His wife and two children returned negative results.

The case intensified high-level discussions between NSW Health Minister Brad Hazzard, senior health bureaucrats and international airline bosses aimed at finding ways to reduce the risk of COVID-19 entering the community via international crew.

The next meeting had been scheduled for Thursday. Mr Hazzard said he was inclined to enforce the same mandatory hotel quarantine restrictions on aircrew that overseas travellers adhere to.

In relation to the northern beaches cases, the pair visited a number of venues while infectious. Health authorities said anyone who visited the below venues is considered close contacts and should get tested and isolate for 14 days, even if they receive a negative result.

In regards to the driver who tested positive, Professor Mary-Louise McLaws said tightening restrictions on where aircrew quarantined would not have prevented the van driver testing positive.

“On buses and vans it is very difficult for the air conditioning to exchange air at a rate per hour high enough to reduce the risk of coming into contact with aerosols,” Professor McLaws said.

“The way the air conditioning is organised inside a bus the air gets dragged towards the front, which places the driver at risk … what you need to do is wind down the windows and air out the bus every time people leave.”

These van drivers must avoid any direct contact with passengers or their belongings, all passengers should be wearing masks and the driver must also wear eye protection, she said.

Professor McLaws also urged the state government to introduce mandatory rapid antigen testing for all crew and passengers on arrival at the airport.

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Esther Han is a journalist at The Sydney Morning Herald. She has covered state politics, health and consumer affairs.

Jenny Noyes is a journalist at the Sydney Morning Herald.

Kate Aubusson is Health Editor of The Sydney Morning Herald.

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