Final answer:
A line server with salmonellosis must isolate from work until recovery, as salmonella can spread through food handling and treatment involves supportive care like rehydration.
Step-by-step explanation:
A line server diagnosed with salmonellosis must isolate from the workplace until fully recovered. Salmonella bacteria, which causes salmonellosis, can be transmitted through ingestion of contaminated food, and by individuals who are infected handling food. Proper hygiene and cooking food thoroughly are key in preventing the spread of salmonella. Since recovery can take up to two weeks, and treatment is predominantly supportive care like rehydration rather than antibiotics, it is crucial for food handlers to stay away from the workplace until they have completely recovered to prevent further spread of the infection.