The snap lockdown ended at 6pm for everyone except residents of Brisbane and Moreton Bay, where mystery infections continue to cause concern.

Communities that have regained their freedom include the Sunshine Coast despite news of the day's fourth case - a university campus worker who was potentially infectious for two days before lockdown began on Tuesday.

Chief Health Officer Dr Jeannette Young says the limited time he spent out and about gave her confidence it was safe to lift stay-home orders on the coast.

But anyone who develops the slightest of symptoms in the Caloundra, Mooloolaba, Sippy Downs or Maroochydore areas has been told to immediately report for testing.

The man works at the Sippy Downs campus of the University of the Sunshine Coast and was there on Monday, June 28, and Tuesday, June 29.

Dr Young said he had minimal contact with others, so the university is not currently a contact-tracing site.

"As we've seen time and time again, the situation is fast-moving, and we will continue to keep the community updated as soon as possible," she said.

Late on Friday, Queensland Health released new contact-tracing locations at Brisbane Airport, Brisbane City, Griffin, Hatton Vale, North Lakes, Redcliffe, Sippy Downs, South Brisbane, Wellcamp, West End and Haigslea.

A full list of new locations is available at the Queensland Health website.

Earlier Dr Young said residents in Brisbane and the neighbouring Moreton Bay local government area would have to spend an extra 24 hours in lockdown due to mystery cases in Brisbane.

She said authorities needed more time to work out where a mother and daughter from Carindale picked up the virus and what variant they have.

So far their infections have not been linked to any of the state's clusters and they were very active in the community while infectious.

One of the exposure sites is the Greek Orthodox Community of St George at South Brisbane, where the mother worked as an administrator for the community respite team.

"There is no indication at this stage that The Greek Club, The GOC Childcare, The Greek Orthodox Church of St George, The Greek Ethnic Language School of St George, or any other Community services have been exposed to any positive cases," the organisation said on Friday.

Other sites include Aldi, Woolworths and Harris Farm stores at West End, and the Mecca Maxima store at the Wintergarden Shopping Centre.

Premier Annastacia Palaszczuk has not ruled out a further extension to the lockdown and says a decision will be made before 6pm on Saturday.

The other case of local transmission reported on Friday was a baggage handler at Brisbane International Airport.

He is the partner of a woman who works on a check-in counter there who tested positive earlier this week for the highly contagious Delta variant.

Queensland has multiple clusters at the moment, including one that escaped from the coronavirus ward at Brisbane's Prince Charles Hospital.

In that case, an unvaccinated traveller who was allowed to come and go between Australia and Indonesia during the pandemic tested positive in hotel quarantine and was sent to hospital where he infected an unvaccinated receptionist.

The Queensland government used that case to demand a dramatic reduction in international arrivals until vaccination rates are dramatically higher.

The state won that battle on Friday when Prime Minister Scott Morrison announced national cabinet had agreed to halve arrivals, to 3035 people a week, from July 14 until at least next year.

But with the change still almost two weeks away, Deputy Premier Steven Miles has warned Queensland could find itself in trouble, with quarantine hotels at capacity.

On Friday, there were 285 rooms left with 259 international arrivals and an unknown number of domestic arrivals due, he said, adding it would take a week to get a new hotel up and running.

Masks remain mandatory outside the home in all areas that were subject to the lockdown, including all 11 local government areas in southeast Queensland, Townsville, Magnetic and Palm Islands.

Australian Associated Press