NSW Health says 10 people at a Western Sydney aged care home have tested positive to COVID-19 in the wake of a staff member working six shifts there despite having symptoms of the virus.

Residents at the Anglicare Newmarch House in Caddens, near Penrith, were placed in lockdown on Saturday after the female worker tested positive.

Health authorities said she worked six days there and another two days at the Greystanes Disability Services in Penrith while infected.

Six staff, including the woman, have now tested positive along with four residents.

In a statement, Anglicare Sydney said all residents in its Caddens facility were self-isolating in its rooms and it had deployed staff specially trained in working with COVID-19 to work residents who had tested positive.

It said all other staff had been directed to wear full personal protective equipment when caring for residents.

The Penrith Greystanes Disability Service also quarantined residents in the house she worked and placed several of its staff in home isolation.

Earlier today, the NSW Premier was full of praise after the state saw a massive drop in new coronavirus infections over the Easter long weekend.

This morning, there were only seven new infections recorded.

While the Newmarch House cases are new, they are yet to be added to the official NSW tally.

NSW Health Minister Brad Hazzard said yesterday the worker had put vulnerable people at risk.

"We have talked about this numerous times, but now it appears that some staff are still going to work, even when they have symptoms," he said.

"Please don't go to work if you're feeling sick. Just don't go."