There is a high probability that all caught the virus in a school environment or on school buses.

"All of the cases identified in the past 24 hours are children aged under 10," Western NSW Local Health District chief executive Scott McLachlan said today.

"There's clearly been a spread event at a school, school bus or other venues. There's some real concern that there's the possibility for further spread of COVID in Cowra."

All of the cases, Mr Mr McLachlan said, are being cared for in the home as part of Western NSW's Care in the Community program.

Cowra was plunged back in to lockdown last week after the town enjoyed one week without stay at home orders.

"What we're seeing in the Cowra is movement of community when stay at home orders are lifted," Mr McLachlan said.

"There's a real risk that one person in the community that is infectious can spread to a lot of people very quickly. I suspect we are going to see case numbers grow in Cowra.

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"When stay at home orders were released people started moving around and that movement became a spread opportunity.

"We certainly see that in the school and young people community in Cowra," he said.

One of the Cowra cases, Mr McLachlan said, "has definitely been infectious in the community".

The other four have been isolating at home.

Mr McLachlan continued his call for residents across the entire region to get tested and vaccinated.

"It's going to be so crucial in getting out of this current situation and stay at home orders," Mr McLachlan said.

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