Final answer:
Untreated shell eggs can be a source of Salmonella foodborne illness, which can cause symptoms such as diarrhea, fever, and abdominal cramps.
Step-by-step explanation:
Untreated shell eggs can be the source of Salmonella foodborne illness. Salmonella bacteria can be found in raw or undercooked eggs, as well as in other foods such as poultry, meat, dairy products, and seafood. Ingesting contaminated eggs can lead to symptoms such as diarrhea, fever, and abdominal cramps.