Four residents of St George Aged Care at Bexley have contracted coronavirus after an infected staff member worked one shift.
NSW chief health officer Kerry Chant revealed the outbreak on Tuesday, where 356 new locally acquired COVID-19 cases and three deaths from the Delta strain were reported in the last 24 hour period.
Fifty-seven cases were infectious in the community, and the isolation status of 157 remains under investigation.
"We have had a confirmed case at the St George Aged Care Centre in Bexley," Dr Chant said.
"A confirmed case, a staff member, worked one shift and was infectious on one level of the facility, where four out of eight residents have tested positive.
"All eight of the residents were vaccinated and the staff member had received the first dose of vaccination
"Appropriate care is being provided."
Dr Chant said there were additional COVID cases in the Hunter region, but no additional cases in Armidale or Tamworth.