Eight locally acquired coronavirus cases have been recorded in SNW today ending 12-days of non community transmission.
Another four cases in overseas travelers in hotel quarantine were also diagnosed in the 24 hours to 8pm on Wednesday, according to NSW Health, bringing the state's total to 4,072.
NSW Premier Gladys Berejiklian said it was likely more cases would come to light in the next few days.
"We anticipate that because we've identified these eight cases, that a number of close contacts and family members could be found to be positive as a result, so it's really, really important for everybody to stay on high alert," she said.
A spokesperson for Macquarie University confirmed that a student was among the new eight cases.
The university's Sports and Aquatic Centre and a Faculty of Arts building are closed on Thursday for deep cleaning, but are expected to reopen on Friday.