Management of the Parq on Flinders buildings sent an email to residents and unit owners on Wednesday evening, advising them that there was a confirmed case of COVID-19 in one of the towers and the resident was in isolation off-site.

The email said management had organised a "thorough clean and sanitisation" of all common surfaces within the building in question, which was due to take place on Wednesday.

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Residents of the Flinders Street complex were asked to get tested for COVID immediately and isolate until they received a negative result if they developed any cold or flu-like symptoms.

Cameron Morgan, a resident of Parq on Flinders, said NSW Health and complex management had handled the situation well.

"While it was a shock and has caused a bit of action to get a test, mine came back negative and I am hopeful that we all come back negative," Mr Morgan said.

He said building management had also given reminders to residents in recent weeks about staying COVID-safe.

"We need to all stay vigilant," he said.

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At least one person with COVID-19 has been at another Flinders Street apartment complex, known as the Aura building.

Residents received a notification from the Illawarra Shoalhaven Local Health District earlier this week that advised anyone at the apartment block any time from July 19 should "monitor for symptoms for 14 days (until August 7). If symptoms occur, get tested immediately and self-isolate until a negative result is received".

An Aura resident said they had not received any advice from NSW Health on whether they needed to get tested or isolate, and questioned why their building was not under the same lockdown measures applied to a Blacktown complex, where six residents across three households were infected.

An Illawarra Shoalhaven Local Health District spokesperson said there was no requirement to lock down any local apartment complexes because the public health unit had identified all casual and close contacts.

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The spokesperson said the public health unit carried out a risk assessment when a resident of an apartment building was confirmed as a COVID case to determine whether anyone else could have been exposed and if there was a public health risk.

"Any other residents identified as close or casual contacts will receive specific advice about whether they need to be tested and isolate or monitor for symptoms," they said.

"General public health advice is provided to others living in the building who are not considered a contact.

"The Public Health Unit liaises with the body corporate or strata manager for apartment buildings to assist in disseminating information to residents who are not close contacts."

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