Batches of alfalfa sprouts sold at supermarkets nationally have been taken off the shelves due to fears they could give customers salmonella after dozens of people became ill.

The recall follows a joint investigation by health and food regulatory authorities into an increase in an unusual type of salmonella infection.

Company Parilla Fresh said it has voluntarily recalled the product while the investigation continues and more tests are done.

As part of the ongoing investigation, health authorities say at least 44 people nationwide have the unusual strain of salmonella, including 18 people in NSW.

NSW Health One Health Branch director Keira Glasgow said shoppers should check their fridge and don't eat the salad.

"There is a risk that if these affected alfalfa sprouts are consumed you

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