Which waterborne disease can be transferred to humans without proper detection?

Typhoid is a waterborne disease caused by the bacterium Salmonella typhi. It can be transmitted to humans through contaminated water or food that is not properly treated or cooked. Detection of typhoid in water sources can often be challenging since it may not be present in high enough concentrations to be easily identified during routine testing. Furthermore, the symptoms of typhoid can take time to manifest, leading to situations where infected individuals may unknowingly spread the disease.

In contrast, other waterborne diseases listed tend to have more clear-cut and immediate symptoms that assist in identification, and there are more standardized methods available to detect their presence in water supplies. This situational difficulty emphasizes the need for stringent water treatment and monitoring protocols to ensure public health safety against typhoid and similar diseases.