What could be a source of Shigella?

The correct answer identifies potato salad as a possible source of Shigella. Shigella is a type of bacteria that typically spreads through fecal contamination of food and water. Foods that are often prepared in large batches and served cold, like potato salad, can be at risk for Shigella if they are handled by someone who has poor hygiene practices or if they are prepared and left out at unsafe temperatures, which allows the bacteria to multiply.

Furthermore, the preparation process of potato salad often involves mixing and handling the ingredients by hand, which increases the risk of transferring bacteria if proper handwashing protocols are not followed. On the other hand, while drinking water can also be contaminated, it's more directly associated with sanitation practices rather than food handling. Turkey and salmon fish filet, if cooked properly, are less likely sources of Shigella as thorough cooking typically destroys harmful bacteria.