What should food service operators do to prevent customer illness from salmonella?

Maintain clean and health standards

Explanation:

Salmonella is a bacteria infection also known as food poisoning, because it is ingested or contracted through contaminated food and water.

Food service operators should;

Keep their environment clean, including the kitchen and utensils.

Refrigerate their Stokes properly.

Treat the water meant for their services.

Monitor employees health and treat if necessary etc.