Health authorities in NSW are investigating one locally-acquired case of COVID-19, as the state moves to ease some restrictions on weddings, schools and community sport.
The state recorded one COVID-19 infection in hotel quarantine in the 24 hours to 8pm on Wednesday. Another locally-acquired case was identified after that reporting period and will appear in Friday's numbers.
NSW Chief Health Officer Kerry Chant said the locally-acquired case was a man in his 50s who was admitted to Campbelltown Hospital, in Sydney's west, and remains in ICU.
The man lived in supported accommodation with two people who have been tested, and his source of infection is under investigation.
"We know that the person attended a range of venues and we're working through that at this moment," Dr Chant said.
NSW Premier Gladys Berejiklian said the extra case is important to remember "we can never be complacent".
"This is an insidious, contagious disease and no matter how well we're doing we have to always be on our guard," she said on Thursday.
It comes as the state government announced the easing of several restrictions on Thursday, including larger dance floors at weddings.
Ms Berejiklian said bridal parties of no more than 20 people will soon be able to take to the dance floor, but cautioned weddings were among the gatherings "where the virus is most contagious".
"It is still a high risk environment and we will ask both the patrons but also the function organisers to make sure that the bridal party, up to 20, is clearly identified and is not different multiples of 20," she said.
Sports Minister Geoff Lee also announced on Thursday children playing school sport will now be allowed to have two spectators, while a number of eased restrictions will be in place from term four.
School choirs will also resume with up to five participants, as long as they are socially distanced, while music ensembles will be able to have unlimited numbers of students.
Parents will also be allowed back on campus to help with activities such as group reading, and year six formals and celebrations will be able to take place.
Meanwhile, thousands of people have already booked trips to South Australia, after the border reopened to NSW for the first time in almost six months.
The border restrictions lifted at midnight after NSW recorded two days with zero community transmission of COVID-19.
South Australia's planned border reopening with NSW will officially go ahead after another day of promising COVID-19 figures, Premier Steven Marshall confirmed. Source: AAP
For the first time in nearly six months, NSW residents travelling to SA will no longer have to complete 14 days of self-isolation.
Ms Berejiklian said the first flight from Sydney to Adelaide on Thursday morning was "a wonderful fight for sore eyes".
"We won't let them down, we will do everything we can in NSW to keep the virus under control."
But she cautioned NSW is not going to have zero cases of community transmission every day.
"We are in the middle of a pandemic," she said.
"NSW has managed to have the conditions we have in place whilst we managed the virus. We hope other states can have that confidence, and a good sign of confidence is bringing down your border."
The decision comes in time for NSW school holidays which start this weekend, and Virgin Australia plans to resume daily flights between Sydney and Adelaide from 2 October.
Ms Berejiklian previously urged vigilance as residents become more mobile than they have been since February this year.
NSW Health is treating 71 COVID-19 cases, including two in intensive care, neither of whom are ventilated.
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