WA Premier Mark McGowan stokes the flames of an ongoing feud with the NSW Government by saying the state should be aiming to eliminate "the virus from Sydney" and not just "tick along" with COVID-19.
The new Berala cluster cases were a man and a woman in their 30s and a child.
They were close contacts of a man and woman in their 30s reported on Sunday as positive cases who were identified after an existing case remembered holding a small gathering at her home on December 27, which she had not previously listed in contact tracing interviews.
Today s three reported cases interacted with yesterday s cases at another household gathering on December 29.
Dr Chant said NSW Health was investigating the series of events for possible subsequent infection events but was confident they had worked through the chain of transmission.
As long as there are flights returning citizens to Australia, elimination of COVID-19 is impossible. Every day we see cases emerge in hotel quarantine around the country, including in Western Australia.
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NSW reported three new local cases during the 24 hours to 8pm on Sunday, all in a family linked to the Berala cluster.
However, two mystery cases were identified after the reporting period: a western Sydney couple whose infections were discovered after one attended Mount Druitt Hospital emergency department with symptoms on the weekend.
In September, the national hot spot definition of a rolling three-day average of three cases a day was presented as a way for states to decide when to close borders. However, many have not used this definition, which itself has become murky in recent weeks.