It's been announced that Albury has two mystery cases, with both unrelated and under investigation.
Residents have been urged to be vigilant, monitor for symptoms and come forward for testing.
The two cases were identified on Wednesday.
It comes as both Albury and Lismore enter a seven-day lockdown from 6pm.
Deputy Premier John Barilaro said they will now work around what will happen with the border bubble.
He said it's unfortunate for the communities to be going back into lockdown and encouraged vaccination.
North Albury's Summit Power, Lavington's Reece Plumbing Centre and a train service from Sydney have been listed as exposure sites.
NSW Health Minister Brad Hazzard announced 1,351 new cases of COVID-19 at the state's morning update, with Albury set to go into a seven-day lockdown from 6pm.
There has been another 12 deaths, six females and six males.
Mr Hazzard stressed the range of ages of those who passed away shows how dangerous the virus is.
He said of the 12 deaths, 10 were not vaccinated.
More than 15,000 people with COVID are being cared for in NSW health system.
Summit Power North Albury and Reece Plumbing Centre Lavington have been listed as COVID exposure sites following two positive cases in Albury on Wednesday.
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