The community COVID-19 outbreak in New South Wales has swollen by another 18 cases, with all but three linked to the Bondi cluster.
NSW Health says 15 of the new cases are linked to the Bondi cluster, two are close contacts of a previously reported unlinked case, and investigations are ongoing into the unlinked case.
With the addition of Monday's cases, 130 community cases have been detected in the 12 days since June 16, with all but six linked to the Bondi cluster.
In a press conference on Monday, Premier Gladys Berejiklian said about a third of new cases isolated for their entire infectious period but "a number of them" isolated for just part.
"Some unfortunately were active in the community. As Dr Kerry Chant has told us already, the cases we are seeing today are a reflection of what may have occurred in the previous week and obviously there is a lag time."
"With this strain, we are seeing almost 100 percent of transmission within households," she said.
"It is really important for everybody to follow the health rules, to look for those venues of concern, to make sure you get tested and isolates if you have been asked to do so."
Parts of Sydney were plunged into lockdown on Friday, with the restrictions extended to include all of Greater Sydney over the weekend.
Berejiklian on Monday reminded Sydney residents to avoid leaving home unless they "absolutely have to".
"We are keen to not have people move around," she said.
"That is the effect of the lockdown, it helps when people don't move around. Please don't go around picking up things or delivering things unless you absolutely have to do.
"We would prefer that people who are ordering in get that contactless opportunities because for the lockdown to have effect, and for us to manage the situation... it is important to limit our movements [and] activity unless we absolutely have no other option."