Two of the three infected residents, who reside at the SummitCare nursing home in Baulkham Hills, have now been transferred to Westmead Hospital as a precautionary measure.
They have been fully vaccinated with the Pfizer vaccine.
It’s believed that the pair transferred to hospital are an elderly couple who shared a room.
The new cases come after the nursing home was placed in “full lockdown” on Friday after an unvaccinated nurse who worked there tested positive.
A second nurse at the home tested positive yesterday.
In a statement, Summit Care said the three infected residents were not showing any symptoms at this stage and were “in good spirits”.
All of the residents’ families have been contacted and are being provided with updates on the situation.
Deep cleaning of the aged care home and regular testing of residents and staff continues.
Yesterday, 226 tests of residents and staff were completed and all but the three infected residents returned negative results.
Of the facility’s 149 residents, 96 per cent are vaccinated.
“The fact that the affected residents are showing no symptoms at this stage shows their early vaccinations have worked,” a Summit Care spokesperson said.
However, all of those workers are not expected to have their first dose until mid-September.
Most of Australia’s almost 1000 virus-related deaths have been in aged care homes.