A client arrives at a hurricane disaster medical area seeking treatment for diarrhea. Which source of contamination should the nurse consider when interviewing the client about exposure?

A. While close living quarters may contribute to disease spread, it is not the most direct source of contamination related to diarrhea. B. Drinking water contaminated by sewage is a significant concern during disasters, often leading to gastrointestinal illnesses such as diarrhea due to pathogens. C. Nosocomial transmission is less likely in a disaster medical area if proper infection control measures are in place. D. Food contamination from floodwaters is a possibility, but drinking contaminated water poses a more immediate and severe risk for diarrhea.