Queensland has added eight cases to its latest coronavirus outbreak in Tuesday's numbers as the state endures its first full day of a three-day lockdown.
Alerts have been issued for Hervey Bay, Toowoomba, Gladstone and Byron after six locally-acquired cases were identified in the past 24 hours. Two of those are under investigation after they were identified via serology rather than testing.
"This means they're historic cases," Queensland Health said in a statement.
The health authority said that all were close contacts of already confirmed cases.
Premier Gladys Berejiklian urged anyone who has returned from Brisbane in recent days to closely monitor the evolving list of venues in Queensland and the restrictions required, saying she would "not be surprised" if NSW cases were revealed in the coming days.
"Suffice to say, we are expecting more cases from Queensland and hopefully most of those cases will be people in isolation ... but we have to accept this is an evolving situation," Ms Berejiklian said.
Queensland's chief medical officer, Dr Jeanette Young, said the numbers were pleasing in that they showed all the transmission was connected to known threads contact tracers are exploring.
"But we've had a lot of people out in the community infectious," Dr Young said, saying the lockdown would help them "get on top of" where the patients had been.
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Premier Annastacia Palaszczuk said the cases reflect two distinct clusters. The remaining two cases were overseas acquired and were identified in hotel quarantine.
NSW Health advises people who have been in greater Brisbane since March 20 must comply with the same restrictions that apply in Queensland.
"This means anyone who has been to Greater Brisbane is required to stay at home, except for essential reasons that include shopping for food and supplies, exercise, work and medical care, under the Public Health Order," NSW Health said.
People who have only transited through Brisbane Airport are exempt but must complete a declaration on arrival back in NSW. Declaration forms were introduced on Saturday for anyone who had been in Brisbane City or Moreton Bay council areas, but has since expanded to include Logal, Ipswich and Redland.
"We are advising people in NSW against non-essential travel to the Greater Brisbane area at this time," NSW Health said.
In NSW, anyone who attended the following venues is urged to get tested immediately and self-isolate for 14 days:
Suffolk Beachfront Holiday Park - women's communal toilets, 143 Alcorn St, Suffolk Park, NSW 24816pm to 6:30pm and 9:10pm to 9:30pm on Friday 26 March 2021,3:20pm to 3:50pm on Saturday 27 March 2021. Anyone who attended this venue is a close contact and must immediately get tested and self-isolate until advised further by NSW Health.